When a muscle undergoes atrophy in response to disuse
A) the size of actin and myosin filaments decreases.
B) all of the above.
C) the muscle gets smaller.
D) there is a reduction in capillary networks.
B
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Match the following:
A) Fixator B) Agonist C) Synergist D) Antagonist 1) Muscle that opposes and reverses the action of another muscle. 2) Muscle that stabilizes the origin of another muscle. 3) Muscle that is primarily responsible for bringing about a particular movement. 4) Muscle that aids another by promoting the same movement.
The melanocytes in very dark skin
A) are more abundant than they are in light skin. B) lack pigment but shrivel up and turn black. C) contain many small pigment granules. D) contain single, large, pigment granules.
Which of the following is incorrect if blood flow to an area of the lungs is reduced while airflow remains normal?
a. The concentration of CO2 in this area decreases. b. The change in CO2 concentration causes smooth muscles of the local airways to relax. c. The change in CO2 concentration leads to increased resistance of local airways. d. The change in O2 concentration leads to dilation of local blood vessels. e. The change in O2 concentration leads to decreased vascular resistance.
Regarding kidney function, in reabsorption,
A) solutes enter the tubular fluid after exiting the peritubular fluid and crossing the tubular epithelium. B) water and solutes are transported from the tubular fluid, across the tubular, epithelium, and into the peritubular fluid. C) blood pressure forces water and solutes across the membranes of the glomerular capillaries and into the capsular space.