Question

multiple choice question
calcium for muscle contraction is stored in the ______.
o mitochondria
o sarcomere
o transverse tubule
o sarcoplasmic reticulum

Explanation:

Calcium ions crucial for muscle contraction are stored in the sarcoplasmic reticulum. The sarcoplasmic reticulum is a specialized endoplasmic - reticulum in muscle cells that releases calcium ions into the cytoplasm to initiate muscle contraction. Mitochondria are the power - houses of the cell for energy production. Sarcomeres are the basic contractile units of muscle. Transverse tubules are involved in the rapid transmission of electrical signals in muscle cells.

Answer:

sarcomere