During skeletal muscle fiber contraction, the I bands and H zones narrow
Indicate whether this statement is true or false.
TRUE
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Red blood cells are placed in a solution of 0.9% NaCl and no diffusion or osmosis is observed. This means that the solution is ________.
A. hypertonic B. hypotonic C. isotonic D. isertonic
The fourth ventricle is in the
A. right cerebral hemisphere. B. brainstem. C. left cerebral hemisphere. D. midline of the brain, beneath the corpus callosum.
The respiratory centers regulate the activities of the respiratory muscles by
A) acting directly to change heart rate and cardiac output. B) responding to conscious control during periods of physiological stress only. C) adjusting the frequency and depth of pulmonary ventilation. D) stimulating the nuclei of the parasympathetic nervous system. E) None of the answers are correct.
An acid is a molecule that releases (donates) ________
A) protons (hydrogen ions) B) hydroxyl ions C) neutrons D) electrons