Viagra is a drug used to treat erectile dysfunction by dilating arteries in the penis. The
neurotransmitter that Viagra affects is
A) nitric oxide. B) acetylcholine.
C) serotonin. D) histamine.
A
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How would an elevated level of thyroid hormone in the body affect skeletal muscles?
A) It would stimulate atrophy. B) It would stimulate hypertrophy. C) It would stimulate energy use and heat production. D) It would decrease heat production by muscle tissue. E) It would cause an increase in muscle mass.
Which of the following is true regarding unmyelinated nerve fibers in the PNS?
A. A Schwann cell folds its plasma membrane around several fibers. B. A Schwann cells wraps its plasma membrane around each individual fiber as it does with myelinated fibers. C. An oligodendrocyte cells wraps its plasma membrane around each fiber as it does with myelinated fibers. D. Satellite cells cluster around each axon to form a pseudo-myelin sheath.
Proteoglycan molecules in the matrix of cartilage
A. make cartilage hard and compact. B. replace collagen fibers in the matrix. C. fill the lacunae. D. give cartilage its resilient nature. E. make the perichondrium very stretchable.
The large intestine functions to
A. store food. B. absorb water. C. digest fat. D. All apply.