Answer: The SA node
Answer choices are:
<span>A. </span>The AV node
<span>B. </span>The SA node
<span>C. </span>The purkinje fibers
<span>D. </span>The AV bundle
The SA node<span> is the heart's natural pacemaker consisting of a cluster of cells located in the upper part of the wall of the right atrium. (the right upper chamber of the heart). The electrical impulses are produced and sent out from there to regulate heartbeat. This is also called the sinus code. </span>
When you compare different organisms and see that they have the same or similar anatomic traits, it's reasonable to assume the organisms share a common ancestor where they would have gotten trait from. (evolution)
Answer:
These fossils looks as if they belong to a whale or a tiger you can tell by the skull structure. but alas look at a hippopotamus skull. they look dangerous.
Explanation:
The ribosomes cause the outer surface of the rough endoplasmic reticulum to appear rough.
Answer:
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Explanation:
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