Question

What two molecules must be present inside the muscle fiber for muscle contraction to occur? A)...

What two molecules must be present inside the muscle fiber for muscle contraction to occur?

A) Calcium ions

B) ATP

C) Acetylcholine

D) Magnesium

E) Norephinephrine

Science   Anatomy-And-Physiology   
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Homework Answers

Answer #1

A and B. Calcium ions and ATP both are required for muscle contraction.

Muscle contraction in skeletal muscle is an energy requiring process for which ATP is required . Actin and myosin utilize the chemical energy of the molecule ATP. ATP breaks the myosin actin cross bridge by pulling back (cocking) myosin head.

Calcium ions are also required for muscle contraction as it causes interaction between actin and myosin during contraction. Calcium binds to troponin, causing position change in tropomysosinexposing the actin sites that myosin will attach to for a muscle contraction.

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