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what happens when a muscle contracts?
a. calcium combines with atp to produce sarcomeres.
b. calcium produces contractions.
c. actin produces myosin and atp.
d. myosin heads attach to and pull on a series of actin-binding sites.
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Ответ:
The answer is D. Myosin heads attach to and pull on a series of acting-binding sites
Ответ:
Children's immune system aren't as developed as adults.
Explanation: