Compared to skeletal muscle, contraction of smooth muscle cells is
A) a slower response to a stimulus and sustained without fatigue.
B) a slower response to a stimulus, sustained without fatigue, and controlled by the somatic nervous system.
C) only sustained without fatigue.
D) only controlled by the somatic nervous system.
E) only a slower response to a stimulus.
A) a slower response to a stimulus and sustained without fatigue.
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Match the term with its description (answers may be used more than once).
1. highly branched cells that transfer nutrients between blood vessels and neurons 2. specialized immune cells that are confined to the CNS 3. cells that form supportive capsules around cell bodies .4 cells that create a selectively permeable epithelial layer to separate fluid compartments of the CNS 5. cells in the CNS that form myelin 6. cells in the PNS that form myelin 7. cells that are a source of neural stem cells 8. cells that myelinate several axons 9. cells that myelinate only one axon each; multiple cells per axon A. ependymal cells B. astrocytes C. satellite cells D. Schwann cells E. oligodendrocytes F. microglia
Fred was admitted to the cardiac unit with chest pains. No arrhythmias and no large changes in the heart rate were observable. Blood samples taken over the next few days showed no increase in enzymes, such as creatine phosphokinase. A possible treatment of the condition is
A. exercise. B. aspirin. C. beta adrenergic blocking agents. D. nitroglycerin. E. calcium channel blocking agents.
The minimum plasma concentration of a substance that results in the excretion of that substance in the urine is the ________.
A. transport maximum B. renal plasma threshold C. renal plasma clearance D. GFR
Sperm are produced in the _____ and complete maturation in the _____
A. epididymis; testes B. ductus deferens; epididymis C. seminiferous tubules; prostate gland D. seminiferous tubules; epididymis E. seminiferous tubules; vas deferens