8 Number the following events of skeletal muscle contraction in the proper order

Question

8 Number the following events of skeletal muscle contraction in the proper order, with number 1 for the first event and number 6 for the last event. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament toward the M line. Calcium ions bind to troponin, which pulls tropomyosin away from actin ATP breaks the actin-myosin attachment, after which ATP is hydrolyzed and myosin is recocked. The myosin head binds to an actin subunit. The energy from ATP The terminal cisternae of the sarcoplasmic reticulum release calcium ions into the sar hydrolysis "cocks" the myosin head into an upright position. coplasm.

Explanation / Answer

Skeletal muscle contraction means shortening and lengthening of skeletal muscle fibres. This generates movement, which causes the attached bones to move. The steps of skeletal muscle contraction are as follows:-

1. The terminal cisternae of the sarcoplasmic reticulum releases calcium ions into the sarcoplasm.

2. Calcium ions bind to troponin, which pulls tropomyosin away from actin.

3. The myosin head binds to an actin subunit.

4. The energy from ATP hydrolysis cocks the myosin head into an upright position.

5. A power stroke occurs as myosin moves into its relaxed position and pulls the thin filament towards M line.

6. ATP breaks the actin- myosin attachment, after which ATP is hydrolysed and myosin is recocked.

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