When vagus nerve stimulation was applied to the frog heart, _______
A) the force of contraction increased
B) the force of contraction decreased
C) the force of contraction increased and the heart rate slowed and eventually stopped
D) the heart rate slowed and eventually stopped
E) the force of contraction decreased and the heart rate slowed and eventually stopped
Ans: D) the heart rate slowed and eventually stopped
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Receptor cells for the sense of touch are __________ cells.
Fill in the blank(s) with the appropriate word(s).
Answer the following statements true (T) or false (F)
1. Atrial natriuretic peptide reduces blood pressure and blood volume by inhibiting nearly all events that promote vasodilation and potassium and water retention. 2. Premenstrual edema may be due to enhanced reabsorption of sodium chloride. 3. Heavy consumption of salt substitutes high in potassium can present a serious clinical problem when aldosterone release is not normal. 4. Hypercalcemia causes muscle tetany 5. The two hormones responsible for the regulation of calcium are pituitary hormone and calcitonin.
Saltatory conduction
a. occurs in unmyelinated nerve fibers. b. is slower than conduction by local current flow because the myelin acts as an insulator to slow the impulse down. c. involves the impulse jumping from one node of Ranvier to the adjacent node. d. refers to the action potential spreading from one Schwann cell to the adjacent Schwann cell. e. more than one of these answers.
The gastric phase of gastric secretion
A. is triggered by taste, sight, thought, or smell of food. B. decreases the release of gastrin in the stomach. C. is mediated by impulses on sympathetic nerves. D. leads to the greatest volume of gastric secretion. E. leads to the least volume of gastric secretion.