Pacemaker of Heart

Q.

How does a frogs heart differ from a human heart?

Q.

What is the position of the heart in the human body?

Q.

At what age is the heart fully developed?

Q.

Which of the following is true concerning the heart’s electrical conduction system?

1. Action potentials pass slowly through the Purkinje fibers.

2. Action potentials pass slowly through the atrioventricular node

3. Action potentials pass slowly through the ventricle wall.

4. Action potentials pass slowly through the atrioventricular bundle.

Q.

Where does atrial natriuretic peptide come from?

Q.

What is the difference between a mans heart and a womans heart?

Q. What function does the artificial pacemaker perform?

1. Decreases the rate of heart beat
2. Increases the rate of heart beat
3. Maintains the normal rate of heart beat
4. None of the above

Q. The correct route through which pulse-making impulse travels in the heart is:

1. SA node → AV node → bundle of His →Purkinje fibres → heart muscles
2. AV node → SA node → Purkinje fibres →bundle of His → heart muscles
3. AV node → bundle of His → SA node →Purkinje fibres → heart muscles
4. SA node → Purkinje fibres → bundle of His → AV node → heart muscles

Q.

Adrenaline directly affects _____.

1. S.A. node

2. B-cells of Langerhans

3. Dorsal root of spinal nerve

4. Epithelial cells of stomach.

Q. Choose the correct statement about the sino-atrial node.

1. Regulates the inflow of blood into aorta
2. Beating of these fibres result in heart sounds
3. They are the neurons originating from the brain and ending at the ventricles
4. Generates action potential without an external stimulus

Q.

Why do we call our heart myogenic?

Q.

Sino-atrial node is called the pacemaker of our heart. Why?