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Why is the S-A node called pace-maker of...

Why is the S-A node called pace-maker of the heart ?

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Why is the SA node called pacemaker of the heart ? Write its full from.

Explain the following : (a) Why does the atrial systole normally precedes the ventricular systole ? (b) Why is S-A node called the pacemaker of the heart ? (c ) Why does the ventricle relax as a closed chamber in the early phase of its diastole ? (d) Why is there no mixing of deoxygenated and oxgenated blood in mammalian heart ? (e ) Why can you palpate the pulse on an artery in each heart beat ? (f) Why does the lymph contain much less proteins than the plasma ? (g) Why does the ventricle contract as a closed chamber in the early phase of its systole ? (h) Why is the closed circulatory system more efficient than the open one ? (i) Why does the left ventricle has a thicker wall than the right ventricle ?

Pace-maker is

Why is sinuatrial (SA) node also called the pacemaker of heart?

Pace maker is

Assertion : The AV node is also called as the pacemaker of the heart. Reasoning : It is because of the fact that the AV node determines the rate of heartbeat.

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

Most suitable reason why SA node act as pacemaker for heart.