A major difference between endocrine and exocrine glands is that endocrine glands are ductless.
Answer the following statement true (T) or false (F)
True
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Differentiation is
A) the transfer of genetic information from one generation to the next. B) the gradual change in anatomical and physiological characteristics from conception to maturity. C) the formation of more specialized cell types through selective changes in genetic activity. D) the fusion of two haploid gametes that results in one diploid zygote. E) a developmental stage of the embryo where body shape becomes discernable.
A(n) ________ gland branches repeatedly before reaching the glandular cells or secretory part.
A. tubular B. compound C. simple D. alveolar
Which of the following is true with regard to membrane potential?
A)Na+ plays the key role in generating the resting membrane potential. B)All cells in the body must maintain a constant voltage across the membrane. C)Because the number of ions producing the membrane potential is so small that it does not change ion concentrations in any significant way, changes in extracellular Na+ will not affect membrane voltage. D)Transient opening of gated Na+ and K+ channels in the plasma membrane is a normal means of activating neurons and muscle cells.
FSH stimulates which cells to synthesize estrogen from androgens?
a. sperm b. spermatogonia c. theca d. granulosa e. Sertoli