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BIOLOGY TOPIC 11 ANIMAL PHYSIOLOGY (HL)

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Question:

What is the 3rd stage of muscle contraction? (6)

Author: Sammy Universe

What is the 3rd stage of muscle contraction? (6)



Answer:

Sliding mechanism w/ myofilaments ATP binds to myosin head = breaks cross bridge ATP hydrolysis causes the head to turn and detach from ADP Myosin head binds to the next binding site and turns back which pulls the actin forward = shortening of sarcomere (muscle contraction) == contraction needs a lot of ATP


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