Question

answer these MCQ dam ho to

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Answer 1

Answer:

Explanation:

1 The skeletal muscle contraction is caused by calcium ions. These calcium ions bind to the protein complex troponin in order to remove the masking of active site on actin. This results in the exposure of the active-binding sites on the actin for myosin. Once exposed, myosin binds to the actin and Pi is released from the ATP molecule which is bound to myosin. Upon this, myosin comes back to a lower energy state. So, the correct answer is option B.

2 The pivot joint between atlas and axis is a type of synovial joint  

3 In humans there are normally 12 pairs of ribs. The first seven pairs are attached directly to the sternum by costal cartilages and are called true ribs. The 8th, 9th, and 10th pairs—false ribs—do not join the sternum…

4 Q - name the iron responsible for unmistaking of active sites for myson for cross  - Bridge activity during muscle contraction

Explanation: Ca++ ions bind with Tpc unit of troponin which is responsible for masking of active sites for myosin through tropomyosin. The event initiates cross-bridge activity during muscle contraction mechanism.

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Answer 2

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