GENERAL ANATOMY
MUSCLE ANATOMY
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Question
[CLICK ON ANY CHOICE TO KNOW THE RIGHT ANSWER]
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Specialized Endoplasmic reticulum that stores Ca ions.
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Membranous channel that extends inward from the sarcolemma to sarcoplasmic reticulum to signal Ca ion release.
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Cell membrane of a muscle cell
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Neurotransmitter
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Detailed explanation-1: -The function of T-TUBULES is to conduct impulses from the surface of the cell (SARCOLEMMA) down into the cell and, specifically, to another structure in the cell called the SARCOPLASMIC RETICULUM.
Detailed explanation-2: -Deep inward extensions of the sarcolemma form a tunnel-like network inside the muscle cell known as: transverse tubules (T-tubules).
Detailed explanation-3: -A muscle fiber is excited via a motor nerve that generates an action potential that spreads along the surface membrane (sarcolemma) and the transverse tubular system into the deeper parts of the muscle fiber.
Detailed explanation-4: -Although they do not have striations and sarcomeres, smooth muscle fibers do have actin and myosin contractile proteins, and thick and thin filaments. These thin filaments are anchored by dense bodies. A dense body is analogous to the Z-discs of skeletal and cardiac muscle fibers and is fastened to the sarcolemma.