Question

multiple choice question
the network of membranous channels that surrounds each myofibril and is a storage site for calcium ions is the
o endoplasmic reticulum
o transverse tubule
o sarcoplasmic reticulum

Explanation:

The sarcoplasmic reticulum is a specialized endoplasmic - reticulum in muscle cells. It surrounds each myofibril and stores calcium ions which are crucial for muscle contraction. The endoplasmic reticulum is a general cell structure not specific to muscle - related calcium storage. Transverse tubules are involved in the transmission of electrical signals in muscle cells but not calcium storage.

Answer:

C. sarcoplasmic reticulum