Answer the following statements true (T) or false (F)
1. A precapillary sphincter is a cuff of smooth muscle that regulates the flow of blood into the capillaries.
2. The carotid sinus reflex protects the blood supply to the brain, whereas the aortic reflex is more concerned with maintaining adequate blood pressure in the systemic circuit as a whole.
3. Vasodilation is a widening of the lumen due to smooth muscle contraction.
4. The pulmonary circulation does not directly serve the metabolic needs of body tissues.
5. The most common form of shock is hypovolemic shock.
1. TRUE
2. TRUE
3. FALSE
4. TRUE
5. TRUE
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