Question

the membranous cellular structures that are important in conducting impulses through the sarcoplasm and in stimulating the release of calcium are called ______

○ cisternae of sarcoplasmic reticulum
○ sarcomeres
○ myosin filaments
○ transverse tubules

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Explanation:

Transverse tubules (T - tubules) are invaginations of the muscle cell membrane that conduct electrical impulses deep into the muscle fiber (through the sarcoplasm) and trigger the release of calcium from the sarcoplasmic reticulum. Sarcoplasmic reticulum cisternae store calcium but don't conduct impulses through the sarcoplasm in the same way. Sarcomeres are the basic contractile units of muscle and myosin filaments are part of the contractile apparatus, not involved in impulse - conduction and calcium release in this context.

Answer:

transverse tubules