The heart is the system's pump and the blood vessels are like the delivery routes and it is a muscle. The pumps are the beat. The heart is a muscle about the size of a fist and it is the muscle in the body that works the hardest. The statement that the heart muscle rests only between beats is true
I would say all of the above, because all of those seem to be true
-hope it helps :3
The microtainer/micro collection tube holds between 250 and 500 μl of blood.
<h3>
What is a Collection tube?</h3>
This is often used in the laboratory and comprises of a plastic reservoir and a lavender color-coded closure.
The microtainer/micro collection tube holds about 250 and 500 μl of blood which is used for diagnosis etc.
Read more about Collection tube here brainly.com/question/24032977
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<span>A. Static is appropriate answer</span>
To preserve the momentum and therefore save enrgery.
