The pacemaker potential is a result of ________.
A. K+ inflow
B. Ca2+ inflow
C. K+ outflow
D. Na+ outflow
E. Na+ inflow
Answer: E
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The penile urethra is enclosed by the ________.
A. corpus cavernosum B. prepuce C. trabecular muscle D. corpus spongiosum E. frenulum
Define motor unit
A) A motor unit is the sum total of all the motor neurons going to a specific muscle. B) A motor unit is the sum total of all the muscle fibers in a whole muscle. C) A motor unit is the maximum tension that a whole muscle can generate with maximum stimulation. D) A motor unit is a motor neuron and all the muscle fibers that it controls. E) A motor unit is the sensory neuron going away from and the motor neuron going to a skeletal muscle.
Name the three major interacting hormonal events associated with the onset of puberty
A) Increased GnRH production, increased LH and decreased FSH production, activation of ovaries and testes by LH. B) Decreased GnRH production due to estrogen and testosterone negative feedback, decrease in LH and FSH release by the anterior pituitary gland, and decreased LH and FSH sensitivity by the ovaries and testes. C) Increased GnRH production, increased sensitivity of the anterior pituitary to GnRH and the subsequent release of LH and FSH, and increased sensitivity of ovaries and testes to LH and FSH. D) Increased hypothalamic LH production, anterior pituitary release of estrogen and testosterone, estrogen activation of ovaries and testosterone activation of testes. E) Increased hypothalamic estrogen and testosterone production, estrogen activation of ovaries and testosterone activation of testes.
In the pulmonary circuit, there is/are ________ pulmonary trunk(s), ________ pulmonary artery(-ies), and ________ pulmonary vein(s).
A. 4; 2; 1 B. 1; 2; 2 C. 1; 2; 4 D. 1; 1; 2 E. 2; 2; 2