Which part of the nephron employs a countercurrent mechanism?
A. Glomerulus
B. Loop of Henle
C. Distal convoluted tubule
D. Juxtaglomerular apparatus
Answer: B. Loop of Henle
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Formation of the neural tube
A. begins at the anterior (head) end and proceeds toward the posterior (tail). B. begins at the posterior and proceeds toward the anterior. C. is caused by compaction of the neural plate. D. begins in the middle and proceeds toward the head and the tail. E. is random in that it can begin and proceed at any location along the neural plate.
Glycogen is formed in the liver during the ________
A) period when the metabolic rate is lowest B) postabsorptive state C) starvation period D) absorptive state
All of the following are part of the conduction zone except:
A. main bronchi. B. respiratory bronchioles. C. segmental bronchioles. D. terminal bronchioles.
Two tracts found within the extrapyramidal system are the
A. rubrospinal and corticospinal. B. spinothalamic and tectospinal. C. vestibulospinal and rubrospinal. D. corticobulbar and vestibulospinal. E. corticospinal and corticobulbar.