As muscles contract, ________

a. actin heads bind to myosin filaments and slide them toward the middle of the sarcomere
b. myosin heads bind to actin filaments and slide them toward the middle of the sarcomere
c. myosin filaments change position
d. filaments change length


b

Biology & Microbiology

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Cultures of a bacterial strain were incubated in a refrigerator (5°C), on a lab bench (22°C), in a 37°C incubator, and in a 50°C incubator.  After incubation, there was no growth at 37°C and 50°C, slight growth in the refrigerator, and abundant growth on the lab bench top.  Which term best describes this organism?

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Where are the sensory receptors for equilibrium located?

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Biology & Microbiology

Mitochondria play an important role in cell necrosis

__________________ Indicate whether the statement is true or false.

Biology & Microbiology