The diagram given here is the standard ECG of a normal person. The P-wave represents the (a) beginning of the systole (b) end of systole (c) contraction of both the atria (d) initiation of the ventricular contraction.

The diagram given here is the standard ECG of a
normal person. The P-wave represents the
(a) beginning of the systole
(b) end of systole
(c) contraction of both the atria
(d) initiation of the ventricular contraction.
by

1 Answer

Answer :

(c) contraction of both the atria
by

Related questions

Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle? a) QRS complex The QRS complex represents ventricular depolarization b) P wave The P wave is an ECG characteristic reflecting conduction of an electrical impulse through the atria. c) PR interval The PR interval is a component of an ECG tracing reflecting conduction of an electrical impulse through the AV node. d) QT interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Description : Which of the following ECG waveforms characterizes conduction of an electrical impulse through the left ventricle? a) QRS complex The QRS complex represents ventricular depolarization b) P ... QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Last Answer : a) QRS complex The QRS complex represents ventricular depolarization

In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart? (a) S - start of systole (b) T - end of diastole (c) P - depolarisation of the atria (d) R - repolarisation of ventricles

Description : In a standard ECG which one of the following alphabets is the correct representation of the respective activity of the human heart? (a) S - start of systole (b) T - end of diastole (c) P - depolarisation of the atria (d) R - repolarisation of ventricles

Last Answer : (c) P - depolarisation of the atria

Which of the following ECG characteristics is usually seen when a patient’s serum potassium level is low? a) U wave The U wave is an ECG waveform characteristic that may reflect Purkinje fiber repolarization. It is usually seen when a patient’s serum potassium level is low. b) T wave The T wave is an ECG characteristic reflecting repolarization of the ventricles. It may become tall or “peaked” if a patient’s serum potassium level is high. c) P wave The P wave is an ECG characteristic reflecting conduction of an electrical impulse through the atria. d) QT interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Description : Which of the following ECG characteristics is usually seen when a patient's serum potassium level is low? a) U wave The U wave is an ECG waveform characteristic that may ... interval The QT interval is an ECG characteristic reflecting the time from ventricular depolarization to repolarization.

Last Answer : a) U wave The U wave is an ECG waveform characteristic that may reflect Purkinje fiber repolarization. It is usually seen when a patient’s serum potassium level is low.

True statements about ECG include: a. the P-R interval corresponds to the duration of atrial systole b. the T-wave ends at the time of aortic valve closure c. the ST segment represents repolarization of the ventricles d. all

Description : True statements about ECG include: a. the P-R interval corresponds to the duration of atrial systole b. the T-wave ends at the time of aortic valve closure c. the ST segment represents repolarization of the ventricles d. all

Last Answer : all

Given below is the ECG of a normal human. Which one of its components is correctly interpreted below? (a) Complex QRS - one complete pulse (b) Peak T - initiation of total cardiac contraction (c) Peak P and peak R together - systolic and diastolic blood pressures (d) Peak P- initiation of left atrial contraction only

Description : Given below is the ECG of a normal human. Which one of its components is correctly interpreted below? (a) Complex QRS - one complete pulse (b) Peak T - initiation of total cardiac ... R together - systolic and diastolic blood pressures (d) Peak P- initiation of left atrial contraction only

Last Answer : (a) Complex QRS - one complete pulse

Assertion `:` First heart sound (LUBB) is produced at the beginning fo ventricular systole stage. Reason `:` During ventricular systole semilunar valv

Description : Assertion `:` First heart sound (LUBB) is produced at the beginning fo ventricular systole stage. Reason `:` During ventricular systole semilunar valv

Last Answer : Assertion `:` First heart sound (LUBB) is produced at the beginning fo ventricular systole stage. Reason ... D. If both Assertion & Reason are false.

What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL ? (a) 125 beats per minute (b) 50 beats per minute (c) 75 beats per minute (d) 100 beats per minute

Description : What would be the heart rate of a person if the cardiac output is 5 L, blood volume in the ventricles at the end of diastole is 100 mL and at the end of ventricular systole is 50 mL ? (a) 125 beats per minute (b) 50 beats per minute (c) 75 beats per minute (d) 100 beats per minute

Last Answer : (d) 100 beats per minute

The following are true about cardiac contraction: a. the P wave initiates the atrial contraction b. atrial contribution to ventricular filling is most effective at fast heart rate. c. b wave is generated by atrial contraction d. fourth heart sound occurs during atrial contraction

Description : The following are true about cardiac contraction: a. the P wave initiates the atrial contraction b. atrial contribution to ventricular filling is most effective at fast heart rate. c. b wave is generated by atrial contraction d. fourth heart sound occurs during atrial contraction

Last Answer : fourth heart sound occurs during atrial contraction

a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart du

Description : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart du

Last Answer : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical ... one of the main symptoms of this disease.

a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart du

Description : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical representation of the graphical activity of the heart du

Last Answer : a. SAN generates as action potential which stimulates atrial systole. b. ECG is an electrical ... one of the main symptoms of this disease.

Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when(a) AV node receives signal from SA node (b) AV valves open up (c) Ventricular walls vibrate due to gushing in of blood from atria (d) Semilunar valves close down after the blood flows into vessels from ventricles.

Description : Doctors use stethoscope to hear the sounds produced during each cardiac cycle. The second sound is heard when (a) AV node receives signal from SA node (b) AV valves open up (c) Ventricular ... blood from atria (d) Semilunar valves close down after the blood flows into vessels from ventricles.

Last Answer : (d) Semilunar valves close down after the blood flows into vessels from ventricles

During ventricular systole `:-`

Description : During ventricular systole `:-`

Last Answer : During ventricular systole `:-` A. Semilunar valves are closed B. About 30 percent ... Bicuspid valves are closed D. Ventricular pressure declines

Match the column - I with column - II. Column-I Column-II (A) P-wave (i) Depolarisation of ventricles (B) QRS complex (ii) Repolarisation of ventricles (C) T-wave (iii) Coronary ischaemia (D) Reduction in the size of T- wave (iv) Depolarisation of atria (v) Repolarisation of atria Select the correct option. (A) (B) (C) (D) (a) (ii) (iii) (v) (iv) (b) (iv) (i) (ii) (iii) (c) (iv) (i) (ii) (v) (d) (ii) (i) (v) (iii)

Description : Match the column - I with column - II. Column-I Column-II (A) P-wave (i) Depolarisation of ventricles (B) QRS complex (ii) Repolarisation of ventricles (C) T-wave (iii) Coronary ischaemia (D) Reduction in the size of T- wave (iv) ... ) (i) (ii) (iii) (c) (iv) (i) (ii) (v) (d) (ii) (i) (v) (iii)

Last Answer : (b) (iv) (i) (ii) (iii)

The QRS complex in a standard ECG represents (a) repolarisation of auricles (b) depolarisation of auricles (c) depolarisation of ventricles (d) repolarisation of ventricles.

Description : The QRS complex in a standard ECG represents (a) repolarisation of auricles (b) depolarisation of auricles (c) depolarisation of ventricles (d) repolarisation of ventricles.

Last Answer : (c) depolarisation of ventricles

Digitalis in creases the force of contraction of ventricles by: A. Increasing the duration of systole B. Increasing the rate of contraction without affecting the duration of systole C. Increasing the rate of contraction, but reducing the duration of systole D. Increasing both the rate of contraction as well as the duration of systole

Description : Digitalis in creases the force of contraction of ventricles by: A. Increasing the duration of systole B. Increasing the rate of contraction without affecting the duration of systole C. Increasing the rate ... of systole D. Increasing both the rate of contraction as well as the duration of systole

Last Answer : C. Increasing the rate of contraction, but reducing the duration of systole

At the end of the ventricular contraction, the maximum arterial pressure is attained, and blood flow is most rapid. This is correctly termed the: a) arterial maximum b) gluteus maximum c) diastolic pressure d) systolic pressure

Description : At the end of the ventricular contraction, the maximum arterial pressure is attained, and blood flow is most rapid. This is correctly termed the: a) arterial maximum b) gluteus maximum c) diastolic pressure d) systolic pressure

Last Answer : ANSWER: D -- SYSTOLIC PRESSURE

Prostaglandins play pathophysiological role in the following except: A. Patency of ductus arteriosus B. Regulation of renal tubular salt absorption C. Ventricular remodeling after myocardial infarction D. Initiation of labour

Description :  Prostaglandins play pathophysiological role in the following except: A. Patency of ductus arteriosus B. Regulation of renal tubular salt absorption C. Ventricular remodeling after myocardial infarction D. Initiation of labour

Last Answer : C. Ventricular remodeling after myocardial infarction 

What does the P wave of an ECG indicate? -Biology

Description : What does the P wave of an ECG indicate? -Biology

Last Answer : answer:

Assertion `:` The pause between the end of the second sound and the beginning of the first sound coincides with ventricular diastole. Reason `:` The s

Description : Assertion `:` The pause between the end of the second sound and the beginning of the first sound coincides with ventricular diastole. Reason `:` The s

Last Answer : Assertion `:` The pause between the end of the second sound and the beginning of the first sound ... . D. If both Assertion & Reason are false.

Premature ventricular contractions are considered precursors of ventricular tachycardia when they a) occur at a rate of more than six per minute. When PVCs occur at a rate of more than six per minute they indicate increasing ventricular irritability and are considered forerunners of ventricular tachycardia (VT). b) occur during the QRS complex. PVCs are dangerous when they occur on the T wave. c) have the same shape. PVCs are dangerous when they are multifocal (have different shapes). d) are paired with a normal beat. A PVC that is paired with a normal beat is termed bigeminy.

Description : Premature ventricular contractions are considered precursors of ventricular tachycardia when they a) occur at a rate of more than six per minute. When PVCs occur at a rate of more than six per minute they ... paired with a normal beat. A PVC that is paired with a normal beat is termed bigeminy.

Last Answer : a) occur at a rate of more than six per minute. When PVCs occur at a rate of more than six per minute they indicate increasing ventricular irritability and are considered forerunners of ventricular tachycardia (VT).

Ventricular contraction in command of `:-`

Description : Ventricular contraction in command of `:-`

Last Answer : Ventricular contraction in command of `:-` A. S.A. Node B. A.V. Node C. Purkinje fibres D. Papillary muscles

Histamine (a) May be released from mast cells by a number of therapeutic agents (b) Causes sedation (c) Decreases the force of contraction of ventricular muscle (d) Can cause strong contractions of the gravid human uterus

Description : Histamine (a) May be released from mast cells by a number of therapeutic agents (b) Causes sedation (c) Decreases the force of contraction of ventricular muscle (d) Can cause strong contractions of the gravid human uterus

Last Answer : Ans: D

if you suspect atrial flutter : Consider digoxin if not already in use because it frequently increases the conduction ratio and decreases the ventricular rate. , Avoid adrenergic and atropinic agents during sedation or anesthesia for cardioversion. Ketamine is relatively contraindicatedthe cause of premature ventricular contraction? decrease O2 supply to the muscle decrease blood supply to the muscle the heart trying to beat fast ______________________________

Description : if you suspect atrial flutter : Consider digoxin if not already in use because it frequently increases the conduction ratio and decreases the ventricular rate. , Avoid adrenergic and ... to the muscle decrease blood supply to the muscle the heart trying to beat fast ______________________________

Last Answer : decrease O2 supply to the muscle

Assertion `:-` The wall of atria release ANF in response to high B.P. and blood volume. Reason `:-` ANF acts as a vasodilator and inhibits the release

Description : Assertion `:-` The wall of atria release ANF in response to high B.P. and blood volume. Reason `:-` ANF acts as a vasodilator and inhibits the release

Last Answer : Assertion `:-` The wall of atria release ANF in response to high B.P. and blood volume. Reason `: ... False. D. If both Assertion & Reason are false.

a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of the ventricles. c. The end of T wave marks the

Description : a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of the ventricles. c. The end of T wave marks the

Last Answer : a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of ... The end of T wave marks the end of _____

a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of the ventricles. c. The end of T wave marks the

Description : a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of the ventricles. c. The end of T wave marks the

Last Answer : a. The P wave represent the electrical excitation of the_____ b. The QRS complex represents the ____ of ... The end of T wave marks the end of _____

Pt. had chest pain and fainting , ECG shows st- elevation and significant Q wave in -v4 and st-depression in inferior leads : Ant. MI Inf. MI Pericarditis Post. MI

Description : Pt. had chest pain and fainting , ECG shows st- elevation and significant Q wave in -v4 and st-depression in inferior leads : Ant. MI Inf. MI Pericarditis Post. MI

Last Answer : Ant. MI

A 70-year-old patient presented with weakness, tiredness and muscle cramps. The ECG showed Q-T prolongation, flattening of T wave and occasional A-V block. His serum K+ was low (2.8 mEq/L). He admitted taking a laxative every day for the past several months. Which laxative could be responsible for the above condition: A. Bisacodyl B. Liquid paraffin C. Methylcellulose D. Bran

Description : A 70-year-old patient presented with weakness, tiredness and muscle cramps. The ECG showed Q-T prolongation, flattening of T wave and occasional A-V block. His serum K+ was low (2.8 mEq ... could be responsible for the above condition: A. Bisacodyl B. Liquid paraffin C. Methylcellulose D. Bran

Last Answer : A. Bisacodyl

Which stage marks the beginning of the project? a ) Initiation b) Planning c) Deciding on a project d) Closing out the previous project.

Description : Which stage marks the beginning of the project? a ) Initiation b) Planning c) Deciding on a project d) Closing out the previous project.

Last Answer : Initiation

ASA standard monitors include all except A. Pulse oximeter B. CVP C. NIBP cuff D. ECG

Description : ASA standard monitors include all except A. Pulse oximeter B. CVP C. NIBP cuff D. ECG

Last Answer : Ans: B

If the purchases made during the year were Rs. 60,000, the balance of stock in trade at the beginning and at the end of the year were Rs. 12,000 and Rs. 9,000 respectively and the gross profit on sales was 1/5th, when which one of the following represents the figure of gross profit for the year ? (A) Rs. 15,750 (B) Rs. 14,000 (C) Rs. 12,500 (D) Rs. 17,250

Description : If the purchases made during the year were Rs. 60,000, the balance of stock in trade at the beginning and at the end of the year were Rs. 12,000 and Rs. 9,000 respectively and the gross profit on sales was 1/5th, when which ... year ? (A) Rs. 15,750 (B) Rs. 14,000 (C) Rs. 12,500 (D) Rs. 17,250

Last Answer : Answer: Rs. 12,500

which venn diagram represents -p?

Description : which venn diagram represents -p?

Last Answer : A+

Which Venn diagram represents p V ~q?

Description : Which Venn diagram represents p V ~q?

Last Answer : A+

Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. Reason `:-` ANF can cause vasodilation and decrease the B

Description : Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. Reason `:-` ANF can cause vasodilation and decrease the B

Last Answer : Assertion `:-` An increase in blood flow to the atria of heart can cause the release of ANF. ... False. D. If both Assertion & Reason are false.

Name the hormone secreted by atria of heart which causes dilation of blood vessel and reduces blood pressure.

Description : Name the hormone secreted by atria of heart which causes dilation of blood vessel and reduces blood pressure.

Last Answer : Name the hormone secreted by atria of heart which causes dilation of blood vessel and reduces blood pressure.

A: Atrial naturiuretic factor is released by wall of atria. R: It inhibits the release of renin from juxta glomerular apparatus.

Description : A: Atrial naturiuretic factor is released by wall of atria. R: It inhibits the release of renin from juxta glomerular apparatus.

Last Answer : A: Atrial naturiuretic factor is released by wall of atria. R: It inhibits the release of renin ... false D. If both Assertion and Reason are false

Blood which heart pumps to lungs is-----? A. deoxygenated blood (Answer) B. lymph fluid C. atria blood

Description : Blood which heart pumps to lungs is-----? A. deoxygenated blood (Answer) B. lymph fluid C. atria blood

Last Answer : A. deoxygenated blood (Answer)

Digitalis induced increase in refractory period of myocardial fibres is most consistent and pronounced in the: A. Atria B. Ventricles C. A-V node D. Purkinje fibres

Description : Digitalis induced increase in refractory period of myocardial fibres is most consistent and pronounced in the: A. Atria B. Ventricles C. A-V node D. Purkinje fibres

Last Answer : C. A-V node

how a person can determine the heart rate of an individual by the observation of ECG?

Description : how a person can determine the heart rate of an individual by the observation of ECG?

Last Answer : how a person can determine the heart rate of an individual by the observation of ECG?

how a person can determine the heart rate of an individual by the observation of ECG?

Description : how a person can determine the heart rate of an individual by the observation of ECG?

Last Answer : how a person can determine the heart rate of an individual by the observation of ECG?

Identify the hormone with its correct matching of source and function. (a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands. (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle. (c) Progesterone - corpus luteum, stimulation of growth and activities of female secondary sex organs. (d) Atrial natriuretic factor - ventricular wall, increases the blood pressure.

Description : Identify the hormone with its correct matching of source and function. (a) Oxytocin - posterior pituitary, growth and maintenance of mammary glands. (b) Melatonin - pineal gland, regulates the ... sex organs. (d) Atrial natriuretic factor - ventricular wall, increases the blood pressure.

Last Answer : (b) Melatonin - pineal gland, regulates the normal rhythm of sleepwake cycle

What is the usual response to digoxin in a patient of atrial fibrillation: A. Restoration of normal sinus rhythm B. Conversion of atrial fibrillation to atrial flutter C. Increase in atrial fibrillation frequency, but decrease in ventricular rate D. Decrease in atrial fibrillation frequency, but increase in ventricular rate

Description : What is the usual response to digoxin in a patient of atrial fibrillation: A. Restoration of normal sinus rhythm B. Conversion of atrial fibrillation to atrial flutter C. Increase in ... decrease in ventricular rate D. Decrease in atrial fibrillation frequency, but increase in ventricular rate

Last Answer : C. Increase in atrial fibrillation frequency, but decrease in ventricular rate

Which binding is inhibited by pactamycin? A- Aminoacyl-tRNA to the A-site of 30S subunit B- Initiator-tRNA to 30S/40S initiation complexes C- Peptidyl t-RNA to the 50S subunit D- Formation of peptide bond in P site

Description : Which binding is inhibited by pactamycin? A- Aminoacyl-tRNA to the A-site of 30S subunit B- Initiator-tRNA to 30S/40S initiation complexes C- Peptidyl t-RNA to the 50S subunit D- Formation of peptide bond in P site

Last Answer : Initiator-tRNA to 30S/40S initiation complexes

During which step of cellular carcinogenesis do cellular changes exhibit increased malignant behavior? a) Progression During this third step, cells show a propensity to invade adjacent tissues and metastasize. b) Promotion During promotion, repeated exposure to promoting agents causes the expression of abnormal genetic information even after long latency periods. c) Initiation During this first step, initiators such as chemicals, physical factors, and biologic agents escape normal enzymatic mechanisms and alter the genetic structure of cellular DNA. d) Prolongation No stage of cellular carcinogenesis is termed prolongation.

Description : During which step of cellular carcinogenesis do cellular changes exhibit increased malignant behavior? a) Progression During this third step, cells show a propensity to invade adjacent tissues and ... of cellular DNA. d) Prolongation No stage of cellular carcinogenesis is termed prolongation.

Last Answer : a) Progression During this third step, cells show a propensity to invade adjacent tissues and metastasize.

The antianginal effect of propranolol may be attributed to which one of the following (a) Block of exercise – induced tachycardia (b) Decreased end – diastolic ventricular volume (c) Dilation of consticted coronary vessels (d) Increased cardiac force (e) Increased resting heart rate

Description : The antianginal effect of propranolol may be attributed to which one of the following (a) Block of exercise – induced tachycardia (b) Decreased end – diastolic ventricular volume (c) Dilation of consticted coronary vessels (d) Increased cardiac force (e) Increased resting heart rate

Last Answer : Ans: A

When the balloon on the distal tip of a pulmonary artery catheter is inflated and a pressure is measured, the measurement obtained is referred to as the a) pulmonary artery wedge pressure. When the balloon is inflated, the tip of the catheter floats into smaller branches of the pulmonary arty until it can no longer be passed and the pressure is recorded, reflecting left atrial pressure and left ventricular end-diastolic pressure.

Description : When the balloon on the distal tip of a pulmonary artery catheter is inflated and a pressure is measured, the measurement obtained is referred to as the a) pulmonary artery wedge ... Cardiac output is determined through thermodilution involving injection of fluid into the pulmonary artery catheter.

Last Answer : a) pulmonary artery wedge pressure. When the balloon is inflated, the tip of the catheter floats into smaller branches of the pulmonary arty until it can no longer be passed and the pressure is recorded, reflecting left atrial pressure and left ventricular end-diastolic pressure.

The mean velocity of blood flow in the aorta during systole is 1.5 × 10–2 m / s. What is the frequency change in an instrument with a signal frequency of 105 Hz (speed of sound in blood, 1570 m / s)?

Description : The mean velocity of blood flow in the aorta during systole is 1.5 × 10–2 m / s. What is the frequency change in an instrument with a signal frequency of 105 Hz (speed of sound in blood, 1570 m / s)?

Last Answer : 1060 kg/m3, very close to pure water's density of 1000 kg/m3. The average adult has a blood volume of roughly 5 litres (11 US pt) or 1.3 gallons, which is composed of plasma ... .4 million (female) erythrocytes: Red blood cells contain the blood's hemoglobin and distribute oxygen. Mature red blood