The light band of a skeletal muscle is known as the ________.
A. Z disc
B. H band
C. A band
D. I band
Answer: D
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During contraction, asynchronous cycling of cross bridges
a. prevents tetany b. prevents thick filaments from slipping backwards c. prevents thin filaments from slipping backwards d. utilizes less ATP e. does not do any of the above
A bruise appears greenish in the skin because:
A) bilirubin from hemoglobin recycling has accumulated in the bruise. B) green-colored hemoglobin leaks from the bloodstream into the bruise. C) the heme group in hemoglobin has broken down into biliverdin. D) dead white blood cells accumulate at the site of injury.
The ________ is absent from most epidermis.
A. stratum granulosum B. stratum basale C. stratum corneum D. stratum spinosum E. stratum lucidum
Capillary walls serve as effective permeability barriers for
A. oxygen and carbon dioxide. B. electrolytes. C. glucose. D. proteins. E. small water-soluble molecules.