All of the following mechanisms assist veins in returning blood to the heart except
A) ventricular systole.
B) respiratory movements.
C) venous valves.
D) gravity.
E) contractions of skeletal muscles.
Correct Answer:
Verified
Q39: When the right atrium contracts, the
A)left atrium
Q40: The P wave of an ECG is
Q41: Arteries contain _ than veins.
A)more smooth muscle
Q42: _ play an important role in controlling
Q43: Exchange of dissolved substances between the blood
Q45: Excess levels of blood K+
A)increase heart rate
Q46: As arterioles constrict, peripheral resistance _ and
Q47: At the venular end of a capillary,
Q48: _ contain nearly 60% of the total
Q49: Valves are found in some
A)capillaries.
B)veins.
C)arteries.
D)arteries and veins.
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