Which statement about precapillary sphincters is CORRECT?
A) They contract when oxygen levels in the tissue are low.
B) They can close off the capillaries by contracting.
C) They are openings that allow large molecules and blood cells to leave the capillary.
D) When the precapillary sphincters are open, blood flows only through the thoroughfare channels.
E) They are voluntary.
Correct Answer:
Verified
Q1: Which of the following enhances the exchange
Q2: The lining of a capillary is called
Q3: Precapillary sphincters
A) serve as valves in veins.
B)
Q5: Blood is moved through the vascular system
Q6: Continuous capillaries
A) have many thin areas called
Q7: What is the order of the blood
Q8: Systemic blood vessels transport blood
A) from the
Q9: Which of the following organs would be
Q10: Which kind of vessel provides a bypass
Q11: In a capillary bed, relaxation of the
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