When a cell is placed in a solution with a very low solute concentration, water diffuses into the cell. Such a solution is called a(n) _________ solution
A. hypertonic
B. hypotonic
C. isotonic
D. endergonic
B
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Put the portions of the male urethra in the correct order, from the urinary bladder to the exterior
a: Spongy part b: Urethral orifice c: Prostatic part d: Membranous part A. b, c, a, d B. c, a, d, b C. b, c, d, a D. c, d, a, b E. b, a, c, d
The __________ nerves carry sympathetic fibers that cause an increased heart rate and force of contraction.
Fill in the blank(s) with the appropriate word(s).
When more action potentials arrive at the axon terminal, how is the postsynaptic cell affected?
A) Neurotransmitter release does not change, but voltages applied to the postsynaptic cell increase. B) Neurotransmitter release increases, thereby increasing the frequency or magnitude of graded potentials in the postsynaptic cell. C) Neurotransmitter release does not change, thus the postsynaptic cell behaves the same way it always behaves. D) Neurotransmitter release increases, but does not change the graded potentials that follow.
Labor begins when the increasing concentration of ________, which stimulate(s) uterine contractions, reaches a point that overrides the effect of ________, which inhibit(s) uterine contractions.
A. relaxin; progesterone B. estrogens; progesterone C. progesterone; estrogens D. relaxin; estrogens