Which Statement About Precapillary Sphincters Is CORRECT

question 142

Multiple Choice

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.

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