Pacemaker of Heart

Q.

What is SA node and AV node? Where are they located? What are their functions?

Q. The four chambers of the heart are separated from each other by a partitions known as___.

Q.

On which part of the human heart is the sinoatrial node located?

1. Right ventricle

2. Right atrium

3. Left ventricle

4. Left atrium

Q.

The impulse of heart beat originates from ___

1. Atrioventricular node

2. Cardiac

3. Vagus

4. Sinoatrial node

Q.

The heart is covered by two layers of membranes. The membranes are called

1. 

2. 

3. 

4. 

Q. The mammalian heart is
(a) myogenic
(b) neurogenic
(c) digenic
(d) none of these

Q. 10.What is the advantage of having four chambered heart? (2)

Q.

The structural makeup of heart has:

1. 5 chambers

2. 2 chambers

3. 3 chambers

4. 4 chambers

Q. What are heart sounds? How are they produced?

[Review question: Pg. No: 215]

Q.

The (i)___, controls both the heart rate and the stroke volume. There are two separate nerves from the cardiovascular centre to the sinoatrial node: the (ii)___, to speed up the heart rate and the (iii)___, to slow it down. (i) receives information from special cells called (iv)___, present in the aortic arch and in the carotid sinus.

1. (i)Cardiac centre, (ii) Parasympathetic system, (iii)Sympathetic system, (iv) Baroreceptors

2. (i)Sympathetic system, (ii) Baroreceptors, (iii)Cardiac centre, (iv)Parasympathetic system

3. (i)Cardiac centre, (ii) Sympathetic system, (iii)Parasympathetic system, (iv)Baroreceptors

4. (i)Baroreceptors, (ii) Sympathetic system, (iii)Parasympathetic system, (iv)Cardiac centre

Q. What is the significance of atrio-ventricular node atrio-ventricular bundle in the functioning of heart?

Q.

Where exactly does the electrical conduction in the heart takes place?

1. AV node

2. Cardiac plexus

3. SA node

4. Purkinje fibres

Q.

How does the human heart continue to beat even after it is taken out of the body or cut in to pieces?

Q.

Origin of heart beat and its conduction is represented by

1. SA node - Purkinje fibres - AV node - Bundle of His

2. Purkinje fibres - AV node - SA node - Bundle of His

3. SA node - AV node - Bundle of His - Purkinje fibres

4. A V node - Bundle of His - SA node - Purkinje fibres

Q. What are heart sounds? How are they produced?

[Review question: Pg. No: 215]