After sperm are produced, they enter the first part of the duct system, the:
a.) ductus deferens
b.) ejaculatory duct
c.) epididymis
d.) urethra
Ans: c.) Epididymis
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Synthesis of neuropeptides differs from that of other neurotransmitters because it
A. takes place on ribosomes in the postsynaptic cell's membrane. B. takes place in the cell bodies of neurons. C. uses amino acids as precursor molecules. D. takes place in the axon terminals of neurons. E. only takes place at synapses outside the central nervous system.
What is postnatal development?
A) Postnatal development refers to the events that occur during the first 2 months after fertilization. B) Postnatal development begins at the 9th week and continues until birth. C) Postnatal development begins at birth and continues to maturity. D) Postnatal development refers to the events of the first and second trimesters. E) Postnatal development refers to the events of the third trimester.
Which of the following explains why people get gray hair as they age?
A. Collagen decreases in quantity and function with aging. B. Melanocytes decrease in function with aging. C. Sebaceous glands decrease in number and function with aging. D. Hair follicles atrophy and decrease in function with aging.
Which of the following is the most abundant positively charged ions in extracellular fluids?
A. H+ B. Ca2+ C. Na+ D. K+