The portion of the nephron that maintains the hypertonicity of the renal medulla is the:
A. proximal convoluted tubule.
B. glomerulus.
C. loop of Henle.
D. distal convoluted tubule.
Answer: C. loop of Henle.
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The atrioventricular (AV) node is located in the
A. floor of the left atrium. B. floor of the right atrium. C. roof of the left ventricle. D. back wall of the right ventricle. E. back wall of the left ventricle.
Beta-blockers ________.
A) increase a dangerously low heart rate B) decrease heart rate and blood pressure C) have widespread sympathetic effects D) are potent antidepressants
The difference in pressure from one end of a vessel to the other is called ________, which greatly determines the rate of flow.
A) osmotic pressure B) pulse pressure C) pressure gradient D) pressure point E) pulse point
Error-correcting signals are sent from the cerebellum through the ________ and the brainstem to the premotor and primary motor cortices.
A. hypothalamus B. pituitary C. pineal body D. thalamus E. pons