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Home Q & A Board Biology-Related Homework Help Anatomy and Physiology
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Jinxed Jinxed
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8 years ago
top down. How does this increase the efficiency of atrial contraction? Do the ventricles have a similar arrangement? If so, how does this work?
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#1
8 years ago
As you know the SA is a pacemaker which helps in setting the rhythm of contraction so that the blood can flow to the ventricle and just like that there is a Atrio-ventrical node in the ventricles, which is situated in the septum, which helps in pushing the blood to the lungs and the whole body.
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#2
8 years ago
Atria contract from the top-down, because their valve to the ventricle is at the bottom of the chamber. Contracting bottom-up would leave the blood with no place to go. Ventricles have an opposite arrangement, their valves are located at the top, so they contract bottom-up, this is why its necessary to go from SA node to AV to the apex, THEN the ventricles (bottom-up)
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