Identify the statement concerning general functional characteristics of muscle that is true
A. Muscle tissue shortens forcefully but lengthens passively.
B. Muscle tissue shortens passively but lengthens forcefully.
C. Muscle tissue can get shorter, but can not get longer.
D. Muscle tissue can get longer, but can not get shorter.
E. None of these statements are true.
A
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Which of the following best describes the term sarcoplasmic reticulum?
A) protein that accounts for elasticity of resting muscle B) repeating unit of striated myofibrils C) storage and release site for calcium ions D) thin filaments are anchored here E) largely made of myosin molecules
Which statement accurately describes alveolar exchange of oxygen?
A. Oxygen diffuses from the alveolus to the blood because the alveolus has a higher partial pressure of oxygen. B. Oxygen diffuses from the alveolus to the blood because the alveolus has a lower partial pressure of oxygen. C. Oxygen diffuses from the blood to the alveolus because the alveolus has a higher partial pressure of oxygen. D. Oxygen diffuses from the blood to the alveolus because the alveolus has a lower partial pressure of oxygen.
Skeletal muscle fibers are formed from embryonic cells called
What will be an ideal response?
Microfilaments
A) are usually composed of myosin. B) are hollow, filamentous structures. C) anchor the cytoskeleton to the plasma membrane. D) are about 25 nm in diameter. E) are found in the cytoplasm radiating away from the centrosome.