To produce a contraction similar to the one in graph (b), the muscle
A) must be stimulated to the point of fatigue.
B) must be stimulated again before it has relaxed from the previous stimulation.
C) is excited by a stimulus of increasing intensity.
D) must go through a rapid series of isolated twitches.
E) generates more and more thin and thick filaments.
B
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The mechanism by which bumblebees and certain moths generate preflight heat in thoracic muscles involves
A) A metabolic futile cycle in carbohydrate metabolism B) The simultaneous contraction of antagonistic flight muscles. C) Rapid wing movement that avoids lift. D) All of the above
How many sperm are produced from one spermatogonium?
A. One B. Two C. Four D. Eight
Which of the following has the greatest range of motion?
A) uniaxial joint B) biaxial joint C) nonaxial joint D) multiaxial (triaxial) joint
Antibodies may bind to superficial sites on bacteria or other toxins, making the toxin incapable of attaching itself to a cell. This mechanism is known as
A) opsonization. B) agglutination. C) phagocytosis. D) neutralization. E) costimulation.