what structure in the skeletal muscle stores calcium? is it a) transverse tubules or b) sarcoplasmic...

what structure in the skeletal muscle stores calcium?

is it

a) transverse tubules or b) sarcoplasmic reticulum?

Expert Solution

What structure in the skeletal muscle stores calcium?

Answer: b) Sarcoplasmic reticulum.

Explanation:

- The sarcoplasm (cytoplasm) of skeletal muscle contains sarcotubular system that consists of T-tubules and L-tubules (sarcoplasmic reticulum).

- T-tubules (transverse tubules) are infoldings of cell membrane (sarcolemma) into the muscle cell. T-tubules allow penetration of electrical membrane discharge into the inner core of muscle cell. T-tubules have dihydropyridine receptors (DHPR receptors)- a voltage gated L-type of calcium channel.

- L-tubules (longitudinal tubules) also known as sarcoplasmic reticulum are longitudinally placed tubules between two T-tubules. Dilated portions of both ends of sarcoplasmic reticulum near the T-tubules are called terminal cisternae which are the storehouse of calcium ions and sites of calcium ions release. L-tubule cisterns have ryanodine receptors (RyR)- a ligand gated calcium ions channel.

- Thus, the calcium ions required during skeletal muscle contraction are stored in the terminal cisternae of sarcoplasmic reticulum (L-tubules).

Sydney Mullin answered 1 year ago

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