PUT THE EVENTS OF MUSCLE CONTRACTION IN ORDER Question 28 options: 12345 Calcium ions attach to...

PUT THE EVENTS OF MUSCLE CONTRACTION IN ORDER

Question 28 options:

12345	Calcium ions attach to the troponin. This causes the tropomyosin to move away from the actin active sites.
12345	An ATP molecule provides the energy to return the myosin cross bridge back to its original (cocked) position
12345	Myosin heads bend and pull the actin over the myosin
12345	Myosin cross bridges attach to the active sites of the actin
12345	Nerve stimulation causes Calcium ions to be released from the Sarcoplasmic Reticulum

Solutions

Expert Solution

1. Nerve stimulation causes Calcium ions to be released from the Sarcoplasmic Reticulum 2.Calcium ions attach to the troponin. This causes the tropomyosin to move away from the actin active sites 3. Myosin cross bridges attach to the active sites of the actin 4. Myosin heads bend and pull the actin over the myosin 5. An ATP molecule provides the energy to return the myosin cross bridge back to its original (cocked) position

Explanation: Action potential reaches sarcoplasmic reticulum through T tubules and stimulates sarcoplasmic reticulum to release calcium. This calcium binds to troponin which moves tropomysin from active site of actin. Then myosin head attaches to actin to form cross bridge. During power stroke myosin head bends which pulls the actin over myosin and causes muscle contraction. After this new molecule of ATP gets attached to myosin and breaks cross bridge and ATP gets hydrolysed to ADP and inorganic phosphate which makes the myosin return to cocked position.

Sydney Mullin answered 7 months ago

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