A wide receiver for the Dallas Cowboys pulled a hamstring muscle. What muscles could be affected and what would the effect be?
What will be an ideal response?
The muscles include the biceps femoris, semitendinosus, and semimembranosus. They are important flexors of the leg and extensors of the thigh. Injuries here could make it impossible to run properly or to bend the thigh.
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Which of the following correctly describes an erection?
A) The spongy tissue in the penis fills with air. B) Parasympathetic neurons release nitric oxide causing dilation of small arteries in the penis. C) Smooth muscles of vascular spaces in the penis contract. D) Parasympathetic impulses constrict arteries leading to the penis.
Answer the following statement(s) true (T) or false (F)
1. Blood flow through a capillary bed is regulated by precapillary sphincters. 2. Large veins, medium veins, and venules have valves to prevent the backflow of blood. 3. The pulmonary circuit is the only route in which arteries carry less oxygen than veins. 4. Lung tissue receives nourishment and waste removal from the pulmonary circuit. 5. The three primary branches of the celiac trunk are the common hepatic, left gastric, and splenic veins. 6. Arterial flow to the lower limb comes from the external iliac artery.
Which of the following is true of the dura mater?
A) The outer (endosteal) layer is fused to the periosteum of the cranial bones. B) It consists of three layers around the brain only. C) It contains the subarachnoid spaces. D) It follows precisely and adheres closely to the contours of the brain tissue. E) None of the answers are correct.
In response to action potentials arriving along the transverse tubules, the sarcoplasmic reticulum releases
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