Question

why S.A node consider as vestigial sino venosus?​

Answer 1

ᗅℕՏᗯℰℛ :-

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The sinoatrial node (SA node), also known as sinus node, is a group of cells located in the wall of the right atrium of the heart. These cells have the ability to spontaneously produce an electrical impulse (action potential; see below for more details), that travels through the heart via the electrical conduction system causing it to contract. In a healthy heart, the SA node continuously produces action potential, setting the rhythm of the heart and so is known as the heart's natural pacemaker. The rate of action potential production (and therefore the heart rate) is influenced by nerves that supply it

It is the integrated activity of these so-called pacemaker (P) cells that form the SA node. ... The sinus node continuously generates electrical impulses, thereby setting the normal rhythm and rate in a healthy heart. Hence, the SA node is referred to as the natural pacemaker of the heart.

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Answer 2

development of the sino-atrial node, have doubted that the node is really a remnant of the sinus venosus, and have sug- gested that it may belong ... already vestigial. There is no clear ...