Which of the following statements regarding skeletal muscle contraction is true?
A. During a lengthening contraction, the tension exerted by the muscle exceeds the load on the muscle.
B. In every isotonic muscle contraction, the length of the muscle remains constant.
C. During every muscle contraction, muscle fibers change length.
D. During every muscle contraction, tension is developed in the muscle.
E. Cross-bridges cycle faster during isometric contractions than during isotonic contractions.
D
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The presence of an enzyme within a chemical system
A. increases activation energy. B. decreases activation energy. C. increases potential energy. D. does not affect either activation energy or potential energy.
When total body input of a particular substance equals its total body output, a(n) ____________________ balance exists
Fill in the blank(s) with correct word
The abdominal cavity is _____ to the pelvic cavity.
Fill in the blank(s) with the appropriate word(s).
Which of the following transport processes always requires metabolic energy?
A) diffusion B) carrier-mediated transport C) vesicular transport D) freely permeable E) impermeable