Multiple Choice
Which of the following is not a means by which venous blood is returned to the heart?
A) The semilunar valves in the vein
B) Respiration, which reduces pressure in the thorax and increases pressure in the abdomen
C) The contraction of skeletal muscles pushing blood through the veins
D) All the above are means by which venous blood returns to the heart.
Correct Answer:
Verified
Correct Answer:
Verified
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