What is the purpose of precapillary sphincters?
A) They regulate blood flow to the heart.
B) They change the amount of blood flowing into capillary beds.
C) They are muscles that pump blood back to the heart.
D) They contract when the tissues need more oxygen and nutrients.
Correct Answer:
Verified
Q1: What is happening during the phase labeled
Q3: The flow of blood from the right
Q4: Which type of circulation sends nutrient rich
Q5: How do you know this is a
Q6: What is the function of the structure
Q7: What is happening during the phase labeled
Q8: How do you know this is a
Q9: What is the name of the structure
Q10: Which of the following structures delays contraction
Q11: Regarding structure C, where is the blood
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