B the sarcoplasm contains the sarcoplasmic reticulum

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b. The sarcoplasm contains the sarcoplasmic reticulum (SR) which stores calcium ions; release of calcium ions from the SR into the sarcoplasm triggers muscle contraction c. The sarcolemma has terminal cisternae and tunnel-like infoldings called T-tubules (transverse tubules) that penetrate into the muscle fiber at right angles to the muscle filaments; the T-tubules conduct muscle action potentials which cause the release of calcium from the SR G. Contraction of Muscle Muscle contraction occurs via the sliding filament mechanism: i. Myosin cross bridges pull thin filaments toward the center of the sarcomere. resulting in a shortening of the sarcomere. ii. This event requires an adequate supply of energy and occurs when calcium ions are released into the cytosol. H. Nerve and Blood Supply: i. Motor neurons send impulses that form neuromuscular junctions and stimulate muscle to contract. ii. Blood vessels deliver nutrients and oxygen to muscle and carry wastes and heat away from muscle. I. Types of Muscle Fibers Based on speed, strength and endurance of contraction; all three types are found in most muscles. a) red slow-twitch fibers: thin fibers contain abundant amounts of This study resource was shared via CourseHero.com
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