What muscle forms the lips?
A. buccinator muscle
B. orbicularis oculi muscle
C. orbicularis oris muscle
D. labial frenulum muscle
C
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The nervous system avoids muscle fatigue during submaximal contraction by
A) asynchronous recruitment. B) synchronous recruitment. C) always recruiting slow-twitch motor units. D) always recruiting fast-twitch motor units.
Which of the following structures contributes the most to the total refractive ability of the eye?
a. lens b. cornea c. ciliary muscle d. retina e. iris
Aldosterone is a steroid hormone that ________ synthesis of Na+/K+ pumps and Na+ channels in principal cells of kidney tubules.
A. inhibits B. stimulates
Which of the following substances is NOT likely to trigger the immune response?
A) pollen grains B) bacteria C) self-antigens D) fungi E) virus particles