The secondary pacemaker of the heart is known as the: a) AV node b) SA node c) Purkinje Bundle d) None of the above

The secondary pacemaker of the heart is known as the: a) AV node b) SA node c) Purkinje Bundle d) None of the above
by

1 Answer

Answer :

ANSWER: A -- AV node
by

Related questions

The correct route through which pulse-making impulse travels in the heart is (a) SA node → Purkinje fibres → bundle of His → AV node → heart muscles (b) SA node → AV node → bundle of His → Purkinje fibres → heart muscles(c) AV node → bundle of His → SA node → Purkinje fibres → heart muscles (d) AV node → SA node → Purkinje fibres → bundle of His → heart muscles.

Description : The correct route through which pulse-making impulse travels in the heart is (a) SA node → Purkinje fibres → bundle of His → AV node → heart muscles (b) SA node → AV node → bundle of His → Purkinje ... fibres → heart muscles (d) AV node → SA node → Purkinje fibres → bundle of His → heart muscles.

Last Answer : (b) SA node → AV node → bundle of His → Purkinje fibres → heart muscles

Rate of heart beat is determined by (a) Purkinje fibres (b) papillary muscles (c) AV node (d) SA node.

Description : Rate of heart beat is determined by (a) Purkinje fibres (b) papillary muscles (c) AV node (d) SA node.

Last Answer : (d) SA node.

The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of (a) atrioventricular bundle (b) Purkinje system (c) sinoatrial node (d) atrioventricular node.

Description : The cardiac pacemaker in a patient fails to function normally. The doctors find that an artificial pacemaker is to be grafted in him. It is likely that it will be grafted at the site of (a) atrioventricular bundle (b) Purkinje system (c) sinoatrial node (d) atrioventricular node.

Last Answer : (b) Purkinje system

Assertion `:` Though AV node generates impulses, it is still not called as the pacemaker of heart. Reason `:` The rythmicity of impulse production is

Description : Assertion `:` Though AV node generates impulses, it is still not called as the pacemaker of heart. Reason `:` The rythmicity of impulse production is

Last Answer : Assertion `:` Though AV node generates impulses, it is still not called as the pacemaker of heart. ... . D. If both Assertion & Reason are false.

Impulse of heart beat originates from (a) SA node (b) AV node (c) vagus nerve (d) cardiac nerve

Description : Impulse of heart beat originates from (a) SA node (b) AV node (c) vagus nerve (d) cardiac nerve

Last Answer : (a) SA node

Which of the following drugs depresses automaticity of SA node as well as ectopic foci, abbreviates action potential duration of Purkinje fibres, and slows atrioventricular conduction: A. Propranolol B. Lignocaine C. Procainamide D. Bretylium

Description : Which of the following drugs depresses automaticity of SA node as well as ectopic foci, abbreviates action potential duration of Purkinje fibres, and slows atrioventricular conduction: A. Propranolol B. Lignocaine C. Procainamide D. Bretylium

Last Answer : A. Propranolol

The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity

Description : The following action of digoxin is responsible for beneficial effect in auricular fibrillation: A. Increased myocardial contractility B. Suppression of SA node C. Depression of A-V conduction D. Enhanced Purkinje fibre automaticity

Last Answer : C. Depression of A-V conduction

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

The pacesetter in the heart is called (a) sino-atrial node (SAN) (b) atrio-ventricular node (AVN) (c) Purkinje fibres (d) papillary muscle.

Description : The pacesetter in the heart is called (a) sino-atrial node (SAN) (b) atrio-ventricular node (AVN) (c) Purkinje fibres (d) papillary muscle.

Last Answer : (b) atrio-ventricular node (AVN)

What structures transmit the heart impulse from the av node to the ventricle?

Description : What structures transmit the heart impulse from the av node to the ventricle?

Last Answer : Bundle of Hisatrioventicular bundle (bundle of his), right and left bundle bramches and the purkinge conducition fibers

Which set is similar? (a) Corpus luteum - Graafian follicles (b) Sebum - Sweat (c) Bundle of His - Pacemaker (d) Vitamin B7 - Niacin

Description : Which set is similar? (a) Corpus luteum - Graafian follicles (b) Sebum - Sweat (c) Bundle of His - Pacemaker (d) Vitamin B7 - Niacin

Last Answer : a) Corpus luteum - Graafian follicles

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

Which of the following terms is used to describe a tachycardia characterized by abrupt onset, abrupt cessation, and a QRS of normal duration? a) Paroxysmal atrial tachycardia PAT is often caused by a conduction problem in the AV node and is now called AV nodal reentry tachycardia. b) Sinus tachycardia Sinus tachycardia occurs when the sinus node regularly creates an impulse at a faster-than-normal rate. c) Atrial flutter Atrial flutter occurs in the atrium and creates an atrial rate between 250-400 times per minute. d) Atrial fibrillation Atrial fibrillation causes a rapid, disorganized, and uncoordinated twitching of atrial musculature.

Description : Which of the following terms is used to describe a tachycardia characterized by abrupt onset, abrupt cessation, and a QRS of normal duration? a) Paroxysmal atrial tachycardia PAT ... fibrillation Atrial fibrillation causes a rapid, disorganized, and uncoordinated twitching of atrial musculature.

Last Answer : a) Paroxysmal atrial tachycardia PAT is often caused by a conduction problem in the AV node and is now called AV nodal reentry tachycardia.

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

Assertion `:` The sino-atrial node (SAN) is called the pacemaker. Reason `:` SAN is responsible for initiating and maintaining the rhythmic contractil

Description : Assertion `:` The sino-atrial node (SAN) is called the pacemaker. Reason `:` SAN is responsible for initiating and maintaining the rhythmic contractil

Last Answer : Assertion `:` The sino-atrial node (SAN) is called the pacemaker. Reason `:` SAN is responsible ... False. D. If both Assertion & Reason are false.

If a Postal or SA finds a registered bundle bearing signs of damage or tampering, he should note the irregularity in the error book/note book and then: (A) Transfer the registered bundle to the Postmaster/HAS (B) Open the registered bundle (C) Open the registered bundle in the presence of the Postmaster / HSA (D) Open the registered bundle in presence of two witnesses

Description : If a Postal or SA finds a registered bundle bearing signs of damage or tampering, he should note the irregularity in the error book/note book and then: (A) Transfer the registered bundle to the ... in the presence of the Postmaster / HSA (D) Open the registered bundle in presence of two witnesses

Last Answer : (A) Transfer the registered bundle to the Postmaster/HAS

Quinidine has the following action on electrophysiological properties of the heart except: A. Decreases automaticity of Purkinje fibres B. Abolishes after depolarizations C. Prolongs refractory period of atrial fibres D. Decreases membrane responsiveness of atrial and ventricular fibres

Description : Quinidine has the following action on electrophysiological properties of the heart except: A. Decreases automaticity of Purkinje fibres B. Abolishes after depolarizations C. Prolongs refractory period of atrial fibres D. Decreases membrane responsiveness of atrial and ventricular fibres

Last Answer : B. Abolishes after depolarizations

A 16-year-old-girl is found to have paroxysmal attacks of rapid heart rate. The antiarrhythmic of choice in most cases of acute AV nodal tachycardia is (a) Adenosine (b) Amiodarone (c) Flecainide (d) Propranolol (e) Quinidine

Description : A 16-year-old-girl is found to have paroxysmal attacks of rapid heart rate. The antiarrhythmic of choice in most cases of acute AV nodal tachycardia is (a) Adenosine (b) Amiodarone (c) Flecainide (d) Propranolol (e) Quinidine

Last Answer : Ans: A

Heart pacemaker?

Description : Heart pacemaker?

Last Answer : DefinitionA pacemaker is a small, battery-operated device that senses when your heart is beating irregularly or too slowly. It sends a signal to your heart that makes your heart beat at the correct pace.Alternative ... takes about 1 hour. You will be given a sedative to help you relax. You will b

Procainamide differs from quinidine in the following respect (a) It does not cause paradoxical tachycardia (b) It has no alfa adrenergic blocking activity (c) It has little antivagal action (d) Both (b) and (c) Ans: D 68. In heart, potassium channels determine (a) Pacemaker function (b) Resting potential (c) Action potential duration (d) All of the above

Description : Procainamide differs from quinidine in the following respect (a) It does not cause paradoxical tachycardia (b) It has no alfa adrenergic blocking activity (c) It has little antivagal action (d) Both (b ... a) Pacemaker function (b) Resting potential (c) Action potential duration (d) All of the above

Last Answer : Ans: D

What is the function of the heart Pacemaker? A. It decreases the heart beat B. It regulates the heart beat C. It increases the heart beat D. It accelerates blood supply to the heart

Description : What is the function of the heart Pacemaker? A. It decreases the heart beat B. It regulates the heart beat C. It increases the heart beat D. It accelerates blood supply to the heart

Last Answer : ANSWER: B

Medical What is the function of the heart Pacemaker? A. It decreases the heart beat B. It regulates the heart beat C. It increases the heart beat D. It accelerates blood supply to the heart

Description : Medical What is the function of the heart Pacemaker? A. It decreases the heart beat B. It regulates the heart beat C. It increases the heart beat D. It accelerates blood supply to the heart

Last Answer : ANSWER: B

The functions of pacemaker is - (1) Regulation of urine formation (2) Regulation of digestion (3) Initiation of heart beat (4) Initiation of respiration

Description : The functions of pacemaker is - (1) Regulation of urine formation (2) Regulation of digestion (3) Initiation of heart beat (4) Initiation of respiration

Last Answer : (3) Initiation of heart beat Explanation: A pacemaker is a medical device that uses electrical impulses, delivered by electrodes contacting the heart muscles, to initiate and regulate the beating of the heart ... is not fast enough, or there is a block in the heart's electrical conduction system.

The effect of noradrenaline on the heart include: a. tachycardiac b. increased duration of the cardiac action potential c. decreased potassium conductance of the membranes of pacemaker cells d. increased strength of cardiac contraction

Description : The effect of noradrenaline on the heart include: a. tachycardiac b. increased duration of the cardiac action potential c. decreased potassium conductance of the membranes of pacemaker cells d. increased strength of cardiac contraction

Last Answer : increased strength of cardiac contraction

If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non- functional, what will be the immediate effect? (a) The flow of blood into the aorta will be slowed down. (b) The ‘pacemaker’ will stop working. (c) The blood will tend to flow back into the left atrium. (d) The flow of blood into the pulmonary artery will be reduced.

Description : If due to some injury the chordae tendinae of the tricuspid valve of the human heart is partially non- functional, what will be the immediate effect? (a) The flow of blood into the aorta will be slowed ... back into the left atrium. (d) The flow of blood into the pulmonary artery will be reduced.

Last Answer : (d) The flow of blood into the pulmonary artery will be reduced.

The functions of pacemaker is (1) Regulation of urine formation (2) Regulation of digestion (3) Initiation of heart beat (4) Initiation of respiration

Description : The functions of pacemaker is (1) Regulation of urine formation (2) Regulation of digestion (3) Initiation of heart beat (4) Initiation of respiration 

Last Answer : Initiation of heart beat

What is SA Node ?

Description : What is SA Node ?

Last Answer : : A special type of muscle located at the top of the right atrium wall of the heart. Node No. 1 SA in Figure.

Function of SA node is

Description : Function of SA node is

Last Answer : Function of SA node is A. Muscular pain B. Contraction of lungs C. Uricotelic D. None of the above

Choose the incorrect statement from the following (a) Sympathetic system increases rate of SA node (b) Sympathetic system causes constriction of coronary arteries (c) Sympathetic system causes increased motility of GIT smooth muscles (d) Sympathetic system causes constriction of sphincter in GIT

Description : Choose the incorrect statement from the following (a) Sympathetic system increases rate of SA node (b) Sympathetic system causes constriction of coronary arteries (c) Sympathetic system causes increased motility of GIT smooth muscles (d) Sympathetic system causes constriction of sphincter in GIT

Last Answer : Ans: C

Adrenaline directly affects on (a) SA node (b) β-cells of Langerhans (c) dorsal root of spinal nerve (d) epithelial cells of stomach.

Description : Adrenaline directly affects on (a) SA node (b) β-cells of Langerhans (c) dorsal root of spinal nerve (d) epithelial cells of stomach.

Last Answer : (a) SA node

Define a secondary vascular bundle. -Biology

Description : Define a secondary vascular bundle. -Biology

Last Answer : answer:

Bundle of His is a network of (a) muscle fibres distributed throughout the heart walls (b) muscle fibres found only in the ventricle wall (c) nerve fibres distributed in ventricles (d) nerve fibres found throughout the heart.

Description : Bundle of His is a network of (a) muscle fibres distributed throughout the heart walls (b) muscle fibres found only in the ventricle wall (c) nerve fibres distributed in ventricles (d) nerve fibres found throughout the heart.

Last Answer : (b) muscle fibres found only in the ventricle wall

‘Bundle of His’ is a part of which one of the following organs in humans? (a) Brain (b) Heart (c) Kidney (d) Pancreas

Description : ‘Bundle of His’ is a part of which one of the following organs in humans? (a) Brain (b) Heart (c) Kidney (d) Pancreas

Last Answer : (b) Heart

What are Purkinje fibers? What is the function of the Purkinje fibres? -Biology

Description : What are Purkinje fibers? What is the function of the Purkinje fibres? -Biology

Last Answer : answer:

Purkinje fibres mainly help in contraction of `:-`

Description : Purkinje fibres mainly help in contraction of `:-`

Last Answer : Purkinje fibres mainly help in contraction of `:-` A. Right auricle B. Left ventricle C. Ventricles D. Aorta

Purkinje fibres are found in `:-`

Description : Purkinje fibres are found in `:-`

Last Answer : Purkinje fibres are found in `:-` A. Brain B. liver C. eyes D. Heart

The axons of the Purkinje cells in the cerebellar cortex: a. terminate in excitatory synapses b. terminate in cerebellar nuclei c. terminate in the spinal cord. d. form the main efferent pathway from the cerebellar cortex

Description : The axons of the Purkinje cells in the cerebellar cortex: a. terminate in excitatory synapses b. terminate in cerebellar nuclei c. terminate in the spinal cord. d. form the main efferent pathway from the cerebellar cortex

Last Answer : terminate in cerebellar nuclei

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.

The electrophysiological effects of digitalis on Purkinje fibres include the following except: A. Enhancement of resting membrane potential B. Decrease in the slope of phase-0 depolarization C. Increase in the rate of phase-4 depolarization D. Abbreviation of action potential duration

Description : The electrophysiological effects of digitalis on Purkinje fibres include the following except: A. Enhancement of resting membrane potential B. Decrease in the slope of phase-0 depolarization C. Increase in the rate of phase-4 depolarization D. Abbreviation of action potential duration

Last Answer : A. Enhancement of resting membrane potential

Is it possible to transmit AV over a wifi network to a Windows based PC?

Description : Is it possible to transmit AV over a wifi network to a Windows based PC?

Last Answer : I’m gonna say no. There are some PC graphics cards that can wirelessly transmit their signal but they are expensive and not very good.

Dish Network remote won't change AV inputs.

Description : Dish Network remote won't change AV inputs.

Last Answer : Which remote are you using exactly? Giving us the make & model number would be of great help.

Experienced PC security enthusiasts: What AV/Firewall/Spyware combo have you found to offer the best protection?

Description : Experienced PC security enthusiasts: What AV/Firewall/Spyware combo have you found to offer the best protection?

Last Answer : I use PCTools Firewall and AntiVirus, as well as ThreatFire and Ad-Aware. So far so good. I’ve been through dozens of FW and AV programs, and I could easily tell you which ones DON’T work. Anything made/sold/offered by Symantec

I just bought an AV Cable for my iPod touch and I can't see anything on the tv?

Description : I just bought an AV Cable for my iPod touch and I can't see anything on the tv?

Last Answer : Yes, under video settings there should be a setting under video settings that says TV out, there’s two video options on my old iPod so if you have a new one it might be different. I’m sure you’ll figure it out.

What will I be able to do with an av cable for my iPod touch?

Description : What will I be able to do with an av cable for my iPod touch?

Last Answer : I read on http://gadgetgrid.com, that you can do all the things Appletv can, but also (of course) check email, an surf the web, and see it all on your tv. If nothing else, you can plug it into your component set, and play your iPod through your stereo system speakers.

What is the full form of AV ?

Description : What is the full form of AV ?

Last Answer : AV full version Artario Virus.

What is the full form of AV ?

Description : What is the full form of AV ?

Last Answer : The full version of AV is Authorized Version. Audio-Visual.

Is TOTAL AV antivirus free version safe to use?

Description : Is TOTAL AV antivirus free version safe to use?

Last Answer : I think free version often are limited. And considering the default windwos antivirus is good enough. I don't see much reason for the free version. I think it would just make things a bit hard to use in free.