Purkinje fibres are found in `:-`

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

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)

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.

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

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

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

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

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

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

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 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

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

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

Last Answer : ANSWER: A -- AV node

Longest fibres are found in

Description : Longest fibres are found in

Last Answer : Longest fibres are found in A. Jute B. Cotton C. Sun Hemp D. Coir

Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Description : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Last Answer : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Description : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Last Answer : Myelinated and unmyelinated nerve fibres are found in PNS respectively are

Assertion :- Each chromatid is attached with two spindle fibres during S-phase :- Reason :- During Anaphse-I each chromosome is found in bivalent form

Description : Assertion :- Each chromatid is attached with two spindle fibres during S-phase :- Reason :- During Anaphse-I each chromosome is found in bivalent form

Last Answer : Assertion :- Each chromatid is attached with two spindle fibres during S-phase :- Reason :- During ... . D. If both Assertion & Reason are false.

Name the three types of fibres found in the areolar tissue.

Description : Name the three types of fibres found in the areolar tissue.

Last Answer : a) White fibres or collagen fibres found in groups. b) Yellow fibres or elastic fibres found singly. c) Reticular fibres, forming a network.

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

Which of the following is not true about ‘sclereids’? (a) These are groups of living cells. (b) These are found in nut shells, guava pulp, pear. (c) These are also called stone cells. (d) These are form of sclerenchyma with fibres.

Description : Which of the following is not true about ‘sclereids’? (a) These are groups of living cells. (b) These are found in nut shells, guava pulp, pear. (c) These are also called stone cells. (d) These are form of sclerenchyma with fibres.

Last Answer : (a) These are groups of living cells

Which of the following is not true about ‘sclereids’? (a) These are groups of living cells. (b) These are found in nut shells, guava pulp, pear. (c) These are also called stone cells. (d) These are form of sclerenchyma with fibres.

Description : Which of the following is not true about ‘sclereids’? (a) These are groups of living cells. (b) These are found in nut shells, guava pulp, pear. (c) These are also called stone cells. (d) These are form of sclerenchyma with fibres.

Last Answer : (a) These are groups of living cells.

Name two textile industries using any animal fibres. Name an important State where these industries are located. -Geography

Description : Name two textile industries using any animal fibres. Name an important State where these industries are located. -Geography

Last Answer : Two textiles industries are : 1. Woollen Industry State—Punjab. 2. Silk Industry State—Karnataka.

Name two textile industries using animal fibres. -SST 10th

Description : Name two textile industries using animal fibres. -SST 10th

Last Answer : Animal fibres Important Centres Silk industry Kashmir; Karnataka—Bangalore and Mysore. Woollen industry Punjab and Haryana—Dhariwal, Amritsar, Ludhiana; Uttar Pradesh— Kanpur; Madhya Pradesh—Gwalior.

Name the process by which silk and wool fibres are made into fabric. -Science-7

Description : Name the process by which silk and wool fibres are made into fabric. -Science-7

Last Answer : Wool and Silk are made into fabric by the process of weaving.

Optical fibres are made up of thin strands of (a) copper material (b) silver material (c) glass like material -Technology

Description : Optical fibres are made up of thin strands of (a) copper material (b) silver material (c) glass like material -Technology

Last Answer : (c) Optical fibres are made up of thin strands of glass like material.

What are spindle fibres? -Biology

Description : What are spindle fibres? -Biology

Last Answer : Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during ... division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.

What is the function of the spindle fibres? -Biology

Description : What is the function of the spindle fibres? -Biology

Last Answer : Spindle fibers form a protein structure that divides the genetic material in a cell. The spindle is necessary to equally divide the chromosomes in a parental cell into two daughter cells during ... division: mitosis and meiosis. During mitosis, the spindle fibers are called the mitotic spindle.

What organelles produce spindle fibres? -Biology

Description : What organelles produce spindle fibres? -Biology

Last Answer : Centrioles produce spindle fibers in animal cells. These spindle fibers are active during mitosis when the DNA has replicated and the chromosomes are pulled apart during anaphase. Plants cells do not have centrioles but they still undergo mitosis.

Centrioles are present only in animals. In such a case how the spindle fibres are held in the cell division of plants? -Biology

Description : Centrioles are present only in animals. In such a case how the spindle fibres are held in the cell division of plants? -Biology

Last Answer : answer:

What is the function of xylem fibres. -Biology

Description : What is the function of xylem fibres. -Biology

Last Answer : The xylem is the vascular tissue responsible for the upward conduction of water and nutrients from the roots. The xylem tissue moves water and nutrients to various parts of the plant such as shoots and leaves. Its major components include xylem parenchyma, xylem fibers, tracheids, and xylem vessels

Phloem fibres function? -Biology

Description : Phloem fibres function? -Biology

Last Answer : Bast fibre (also called phloem fibre or skin fibre) is plant fibre collected from the phloem (the "inner bark", sometimes called "skin") or bast surrounding the stem of certain dicotyledonous plants. They support the conductive cells of the phloem and provide strength to the stem.

Optic fibres are mainly used for which purpose? -Do You Know?

Description : Optic fibres are mainly used for which purpose? -Do You Know?

Last Answer : answer:

Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-

Description : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :-

Last Answer : Bundles of striated muscle fibres called fasciculi are surrounded by a sheath called :- A. Epimysium B. Perimysium C. Exomysium D. Endomysium

The surface of nerve fibres bear narrow areas called

Description : The surface of nerve fibres bear narrow areas called

Last Answer : The surface of nerve fibres bear narrow areas called A. Schwann cells B. Schwann nodes C. Nissl granules D. Nodes of Ranivier

Cells which envelop nerve fibres and form myelin sheath around the axon are

Description : Cells which envelop nerve fibres and form myelin sheath around the axon are

Last Answer : Cells which envelop nerve fibres and form myelin sheath around the axon are

Cells which envelop nerve fibres and form myelin sheath around the axon are

Description : Cells which envelop nerve fibres and form myelin sheath around the axon are

Last Answer : Cells which envelop nerve fibres and form myelin sheath around the axon are

Collagen fibres are secreted by

Description : Collagen fibres are secreted by

Last Answer : Collagen fibres are secreted by A. Mast cells B. Macrophage C. Histiocytes D. Fibroblasts

Yellow fibres are present in

Description : Yellow fibres are present in

Last Answer : Yellow fibres are present in A. Arrange in bundles B. Singly and branched C. Singly and undranched D. Unbranched & arrange in bundles

Assertion :- Kinetochore is essential for cell division. Reason :- Kinetochores serve as the sites of attachment of spindle fibres to the chromosome.

Description : Assertion :- Kinetochore is essential for cell division. Reason :- Kinetochores serve as the sites of attachment of spindle fibres to the chromosome.

Last Answer : Assertion :- Kinetochore is essential for cell division. Reason :- Kinetochores serve as the sites of ... D. If both Assertion & Reason are false.

At metaphase, chromosmes are attached to the spindle fibres by their

Description : At metaphase, chromosmes are attached to the spindle fibres by their

Last Answer : At metaphase, chromosmes are attached to the spindle fibres by their A. Centromere B. Satellites C. Secondary cnstrictions D. Kinetochores

Part of Chromosome which joins with spindle fibres is -

Description : Part of Chromosome which joins with spindle fibres is -

Last Answer : Part of Chromosome which joins with spindle fibres is - A. Chromatid B. Chromonema C. Chromomere D. Centromere

Muscle fibres having rounded ends are

Description : Muscle fibres having rounded ends are

Last Answer : Muscle fibres having rounded ends are A. Unstriped muscles B. Smoothe muscles C. Striated muscles D. All the above

Which of the following fibres are made of polyamides?

Description : Which of the following fibres are made of polyamides?

Last Answer : Which of the following fibres are made of polyamides? A. Dacron B. Orlon C. Nylon D. Rayon

Which of the following is common example of fibres?

Description : Which of the following is common example of fibres?

Last Answer : Which of the following is common example of fibres? A. Bakelite B. Buna-S C. Nylon-66 D. PVC

What is the difference between staple and filament fibres?

Description : What is the difference between staple and filament fibres?

Last Answer : Need answer

In animal cell xhich structure is thougth to produce the spindle fibres that help separate the sister chromatids during anaphase?

Description : In animal cell xhich structure is thougth to produce the spindle fibres that help separate the sister chromatids during anaphase?

Last Answer : What is the answer ?

Optic fibres are mainly used for which purpose?

Description : Optic fibres are mainly used for which purpose?

Last Answer : – Communication

Dietary fibres are rich in (A) Cellulose (B) Glycogen (C) Starch (D) Proteoglycans

Description : Dietary fibres are rich in (A) Cellulose (B) Glycogen (C) Starch (D) Proteoglycans

Last Answer : Answer : A

The primary structure of fibroin, the principal protein of silk worm fibres consists almost entirely of (A) Glycine (B) Aspartate (C) Keratin (D) Tryptophan

Description : The primary structure of fibroin, the principal protein of silk worm fibres consists almost entirely of (A) Glycine (B) Aspartate (C) Keratin (D) Tryptophan

Last Answer : Answer : A