What class of neurons in the central nervous system sends commands to muscles?
A. afferent neurons
B. efferent neurons
C. peripheral neurons
D. interneurons
B
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Which of the following are the deep crevices of the brain surface that separate the different lobes of the brain?
A. topographical features B. cortexes C. sulci D. the corpus callosum
How does the loop of Henle enable the mammalian kidney to produce hypertonic urine?IThe ascending limb of the loop actively extrudes Na+.IIThe descending limb interacts with the ascending limb to raise the osmolarity of the extracellular fluid in the renal medulla.IIIThe concentration is further enhanced by the presence of urea, which draws water out of the collecting ducts by osmosis.
A. Just III B. II and III C. Just I D. I, II, and III E. I and II
Which of the following is true of iodine?
a. Many pregnant women in the United States are likely deficient in iodine. b. Iodine toxicity significantly impairs brain development and function. c. Iodine has many well-established roles in the body. d. The majority of iodine in the American diet is provided by seafood.
Which of the following cell types is specifically responsible for cell-mediated immunity?
What will be an ideal response?