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Questions and Answers
Which of the following statements about precapillary sphincters is false?
Which of the following statements about precapillary sphincters is false?
- They are regulated by the nervous system to control blood flow. (correct)
- They are usually slightly constricted to prevent overfilling of capillaries.
- They constrict or dilate depending on the metabolic needs of tissues.
- They are found at the beginning of each capillary network.
What is the primary function of the tunica media in blood vessels?
What is the primary function of the tunica media in blood vessels?
- To provide structural support and regulate blood pressure. (correct)
- To filter waste products from the blood.
- To transport oxygen and nutrients to tissues.
- To produce red blood cells and platelets.
Which of the following tissues does not have capillaries?
Which of the following tissues does not have capillaries?
- Liver
- Skeletal muscle
- Kidney
- Epidermis (correct)
What is the role of precapillary sphincters in regulating blood flow?
What is the role of precapillary sphincters in regulating blood flow?
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Which of the following statements about the tunica media is correct?
Which of the following statements about the tunica media is correct?
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