1. Observe the above graph and nd out the region of graph where muscle

1.	1. Observe the above graph and nd out the region of graph where muscle show maximum contraction. Justify your answer. 2. Name the different types of muscle proteins present in thick and thin laments.3. Ca2+ is necessary for muscle contraction. Why?
Answer» 1. Region 2 During Muscular contraction amount of Ca²⁺ released from ER is very high. 2. Thick lament – Muscle protein – myosin Thin lament – Muscle protein – actin, troponin, tropomyosin. 3. Muscle contraction is regulated by a regulator protein troponin. Troponin mask the active site of actin molecule from myosin head, Action potential reaching a muscle cause the ER to release Ca²⁺ . This Ca²⁺ bind with the specific site of troponin. It causes a conformational change by which the active site of actin molecule is exposed and it results in cross bridge activity and muscle contraction.

1. Observe the above graph and nd out the region of graph where muscle show maximum contraction. Justify your answer. 2. Name the different types of muscle proteins present in thick and thin laments.3. Ca2+ is necessary for muscle contraction. Why?

Answer»

1. Region 2 During Muscular contraction amount of Ca²⁺ released from ER is very high.

2. Thick lament – Muscle protein – myosin Thin lament – Muscle protein – actin, troponin, tropomyosin.

3. Muscle contraction is regulated by a regulator protein troponin. Troponin mask the active site of actin molecule from myosin head, Action potential reaching a muscle cause the ER to release Ca²⁺ .

This Ca²⁺ bind with the specific site of troponin. It causes a conformational change by which the active site of actin molecule is exposed and it results in cross bridge activity and muscle contraction.

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