What factors determine the maximum frequency of action potentials conducted by an axon?
What will be an ideal response?
Maximum frequency is mostly dependent upon the duration of the absolute refractory period, which determines the upper limit. The diameter of the axon, amount of myelination present, and the magnitude of the Na+ and K+ gradients across the axonal membrane all affect action potential velocity may also play a secondary role.
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Within a kidney, which of the following structures is most numerous?
A. Proximal convoluted tubules B. Minor calyces C. Arcuate veins D. Renal pelves E. Cortical radiate arteries
Which of the following is a product of glycolysis?
A. Acetyl-CoA B. Lactate C. Glucose D. Pyruvate E. Carbon dioxide
Which of the following bones contains a diaphysis?
A) patella B) carpal C) sternum D) tibia
Erection and ejaculation can be initiated by
A. manual stimulation of the penis. B. contraction of smooth muscle. C. impulses from the cerebellum. D. increased blood levels of testosterone. E. increased levels of LH and FSH.