A muscle contraction where fibers cannot relax at all between stimuli is called

a. an action potential.
b. a muscle twitch.
c. fatigue.
d. tetanus.
e. constriction.


D

Biology & Microbiology

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The bladder lies within the ___ cavity

a. abdominal b. thoracic c. pelvic d. cranial e. spinal

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A systematic way of obtaining knowledge about the natural world is

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Biosphere is the term used for all parts of earth inhabited by living organisms.

a. true b. false

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