First slide

Muscle

Question

What would be the immediate consequence if a contracting muscle fibre suddenly gets deprived of ATP?

Difficult

A

Cross bridges fail to detach from actin
B

Muscle fibre instantly relaxes
C

All the calcium will be transported into the sarcoplasmic cisternae
D

Myosin heads fail to bind to actin

Solution

In the absence of ATP, the head of myosin cannot detach from actin. After death, depletion of ATP and leakage of calcium from the sarcoplasmic cisternae leads to rigor mortis.

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