When acetylcholine binds to receptors at the motor end plate, the sarcolemma becomes
A) more permeable to sodium ions.
B) less permeable to sodium ions.
C) more permeable to calcium ions.
D) less permeable to potassium ions.
E) less permeable to potassium and sodium ions.
A
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Continuous capillaries
A. are freely permeable to large molecules such as hormones. B. have a wall where the endothelial cells fit very tightly together. C. are more permeable than fenestrated capillaries but not as permeable as sinusoidal capillaries. D. have many thin areas called fenestrae. E. are characterized by continuous pores.
Which statement is incorrect?
a. The myenteric plexus is located in the submucosa. b. The intrinsic plexuses innervate smooth muscle and exocrine and endocrine glands. c. The plexuses are influenced by extrinsic nerves. d. The plexuses coordinate local digestive tract activity. e. There are two major networks of nerve fibers forming the plexuses of the gut.
Rugae are
A) mucosal ridges in the stomach. B) involved in absorption of liquids from the stomach. C) pockets in the lining of the stomach that contain secretory cells. D) located in the esophagus. E) present when the stomach is at maximum distention.
Why does mean arterial pressure only increase slightly during exercise when cardiac output increases many-fold?
What will be an ideal response?