What is the process of muscle contraction?

Question

Describe it. Include the steps in the sliding filament theory of muscle contraction. Use proper terminology.

Answer 1

A muscle contraction (also known as a muscle twitch or simply twitch) occurs when a muscle cell (called a muscle fiber) lengthens or shortens. Locomotion in most higher animals is possible only through the repeated contraction of many muscles at the correct times. Contraction is controlled by the central nervous system comprised of brain and spinal cord. The brain controls voluntary muscle contractions, while the spine controls involuntary reflexes.

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Answer 2

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Answer 3

1.) ATP energizes myosin head (cross bridge) 2.) Muscle cell is stimulated by neuron 3.) Message transferred by T tubules deep into muscle 4.) Calcium released from sarcoplasmic reticulum 5.) Calcium binds to troponin or actin 6.) This causes tropomyosin to move away from binding site 7.) Myosin attaches to actin 8.) Power stroke occurs 9.) Muscle contracts 10.) More ATP allows more heads to attach 11.) Calcium pumped back into sarcoplasmic reticulum 12.) Muscle relaxes