ATPase activity is found in:

1. Myosin head 2. Myosin tail
3. G-Actin 4. Troponin
Subtopic:  Energy for Muscle Contraction |
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During relaxation of a skeletal muscle:

1. Calcium ions that are bound to troponin C now bind to troponin A
2. Cross bridge formation between myosin head and actin takes place
3. The A band of the sarcomere lengthens
4. Calcium ions are pumped back to the sarcoplasmic cisternae
Subtopic:  Sliding Filament Theory | Energy for Muscle Contraction |
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During muscle contraction, when the myosin head releases ADP and iP it:
1. forms cross bridge with actin
2. pulls actin towards M-line
3. goes back to its relaxed state
4. gets detached from the cross bridge

Subtopic:  Sliding Filament Theory | Energy for Muscle Contraction |
Level 3: 35%-60%

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Which of the following masks the active sites on actin when a skeletal muscle is relaxed?

1. Tropomyosin 2. Troponin
3. Calmodulin 4. Ubiquitin
Subtopic:  Sliding Filament Theory | Energy for Muscle Contraction |
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Level 1: 80%+

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