Multiple Choice
All the following facilitate the return of blood to the heart except
A) one-way valves that prevent backflow.
B) squeezing of veins by contractions of smooth muscles of the digestive tract.
C) muscles involved in inhalation.
D) squeezing of veins by contractions of surrounding skeletal muscles.
E) gravity, when veins are above the heart.
Correct Answer:
Verified
Correct Answer:
Verified
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