In mammalian lungs gas exchange occurs
a. in the bronchioles.
b. Across the surface of the type II cells.
c. in the alveoli.
d. the pores of Kohn.
e. two of these.
C
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Label muscle "E" on the diagram
A. orbicularis oculi B. temporalis C. trapezius D. sternocleidomastoid E. masseter
Causes of erectile dysfunction include
A. too much sex. B. underlying disease, such as diabetes mellitus. C. not enough sex. D. too much exercise.
Action potential frequency is best described as:
A) The strength of the muscle contractions. B) The distance the action potential travels in a second. C) The duration of an action potential. D) The number of action potentials produced per unit of time.
Which other body system excretes the same wastes, like urea, that the urinary system excretes?
A) Integumentary system B) Respiratory system C) Digestive system D) No other body system excretes urea.