Problem 3: In discussing the anatomy of the heart and the sequence and timing of

Question

Problem 3: In discussing the anatomy of the heart and the sequence and timing of cardiac excitation in class, I brought an apparent contradiction to your attention: That the internodal pathways connecting the SA and AV nodal regions are specifically designed to rush the SA "signal" to the AV node, where t is subsequently delayed before being passed on to the ventricles via the purkinje system. Adopt a speculative posture and address the following questions a) Why might the heart go to all of the trouble of rushing the SA signal to the A V nodal region when it's going to be intentionally delayed once it arrives anyway, and b) Why provide 3 separate internodal pathways, along with an interarterial band?

Explanation / Answer

a) Heart is an organ which pumps blood continously through the blood vessels of our body.The electrical signals arising in the SA node stimulate the atria to contract and travel to the atrioventricular node(AV node).The structure of the heart is built in such a way that,it occurs naturally.The movements or functions of the heart cannot be controlled.

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