The sarcolemma is the
A. cell membrane of a muscle fiber.
B. cytoplasm of muscle cells.
C. structural and functional unit of the skeletal muscle cell.
D. contractile thread that extends the length of the muscle fiber.
E. protein strand composed of actin.
A
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During pregnancy, a woman's areolae and nipples become darker under the influence of
A. melanin from the pineal gland. B. vasopressin from the posterior pituitary gland. C. melanocyte-stimulating hormone from the placenta. D. estrogen and progesterone from the ovary.
The joint between the trapezium and the first metacarpal is a:
a. plane joint b. saddle joint c. ball and socket joint d. condylar (ellipsoidal) joint
The hypothalamic-hypophyseal portal system is a special blood supply that provides a connection between the hypothalamus and the pituitary gland.
a. true b. false
Sympathetic stimulation of the heart causes the heart rate to
A. increase, then decrease. B. increase. C. decrease. D. stay the same.