A neuron is exposed to a drug that completely blocks voltage-gated potassium channels, but has no effect on non-gated channels or the sodium-potassium pump. Which of the following describes the effect on action potential generation?
A. Resting potential would not be maintained, as potassium could not leak out of the neuron.
B. Repolarization will never occur after threshold is crossed and sodium will continue to flow into the neuron.
C. Repolarization will still occur, but at an inefficiently slow rate.
D. Threshold will never be crossed, and therefore an action potential will never be generated.
Answer: C
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Which glial cells convert glucose to lactate and contribute to the nourishment of neurons?
A. Oligodendrocytes B. Astrocytes C. Microglia D. Ependymal cells E. Schwann cells
.Mrs. Mulligan goes to her dentist and, after having a couple of cavities filled, her dentist strongly suggests that she reduce her intake of sodas and increase her intake of calcium phosphates in the foods she eats. Why?
Sodas contain lots of sugar that can dissolve the calcium carbonate in bone and teeth. Sodas are strong acids that can dissolve the calcium phosphate in bone and teeth. Sodas are carbonated, and the increased carbon dioxide can dissolve the calcium carbonate in bone and teeth. Sodas are strong bases that can dissolve the calcium phosphate in bone and teeth. Sodas contain lots of sugar that can dissolve the calcium phosphate in bone and teeth.
During the early steps of glycolysis, glucose is converted to glucose 6-P, and then glucose 6-P is converted directly to
A. isomerase. B. NADH. C. fructose 6-P. D. aldolase. E. pyruvate.
Amino acids can be used to synthesize proteins for cellular structures, to synthesize proteins that function in various body processes, and for energy.
Answer the following statement true (T) or false (F)