What is the role of NADH in metabolism?
A) convert pyruvic acid into acetyl-coA
B) produce bicarbonate ions for a pH buffer
C) transport hydrogen atoms to coenzymes
D) produce carbon dioxide
E) phosphorylate ADP into ATP
C
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The muscle tone of the ________ along the colon contracts it lengthwise, causing its walls to bulge and form pouches called ________
A) internal sphincters; omental (epiploic) appendages B) haustra; taeniae coli C) circular folds; ceca D) internal sphincters; ceca E) taeniae coli; haustra
Only certain organisms possess gene variants that are able to exchange Na+ for K+, thus making the Na+/K+ ATPase unique to
A) Animals. B) Fungi. C) Plants and animals. D) Fungi and plants.
If five action potentials arrive at the same synapse in very close succession, which of the following would occur?
A. The direction of the action potential is reversed. B. Temporal summation occurs. C. Spatial summation occurs. D. Hyperpolarization occurs. E. Depolarization always occurs.
The _______ arteries branch from the ascending aorta
Fill in the blank(s) with the appropriate word(s).