First slide

Muscle

Question

Which of the following pumps are found in large numbers on the cisternae of the sarcoplasmic reticulum?

Moderate

A

Na⁺ pumps
B

proton pumps
C

Ca²⁺pumps
D

K⁺ pumps

Solution

Cisternae are the bulged region of sarcoplasmic reticulum which are a store house of calcium. Hence the pumps present on these are Ca²⁺- ATPase pumps. A nerve stimulus causes spread of action potential through T-tubules of a muscle fibre. This triggers release of calcium ions from the cisternae which bind to troponin of thin filaments. The muscle contraction is initiated.

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