When a muscle acts as a pump what is a necessary property for the muscle to function efficiently?
A) Antagonistic contraction
B) Antagonistic relaxation
C) Simultaneous contraction
D) Simultaneous relaxation
C
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Simultaneous contraction is a necessary property for a muscle that acts as a pump. A hollow pumping mechanism must also pause long enough in the pumping cycle to allow the chambers to fill with fluid. The heart muscle relaxes long enough to ensure adequate filling; the more completely it fills, the stronger the subsequent contraction is. This occurs because the muscle fibers of the heart, stretched by the increased volume of blood that has returned to them, spring back to normal size. This property is defined through Starling's law of the heart. Simultaneous relaxation or antagonistic contraction or relaxation is not necessary.
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