Lab 5 Homework Using the key, identify the structures described below (not all l
ID: 195261 • Letter: L
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Lab 5 Homework Using the key, identify the structures described below (not all letters will be used e. perimysium h. sarcolemma i·sarcomere b. epimysium c. fascicle d. muscle fiber e, myofibril f. myofilament i. sarcoplasnm k. sarcoplasmic reticulum L T-tubule 1connective tissue covering a bundle of muscle fibers 2 bundle of muscle fibers contractile unit of muscle is made up of actin or myosin Sstores Ca" and regulates its release 6, plasma membrane of muscle cell 8extensions of the sarcolemma that penetrate the center of muscle fibers 10.a muscle cell Use the key to identify the regions and landmarks of the skeletal muscle. rod-like organelle with banded appearance found within muscle fibers 9 thin connective tissue surrounding each muscle fiber a. epimysium b. perimysium c. endomysium d. fascicle e. blood vessel f. muscle fiberExplanation / Answer
1. Perimysium is a connective tissue which covers the bundle of muscle fibers and it connects the muscle fibers with blood vessels and nerves.
2. Fascicle is a bundle of muscle fibers which holds the individual muscle fibers together.
3. Contractile unit of muscle is called as sacromere which is the repeating and basic unit of skeletal muscle tissue.
4. Myofilament is made up of actin and myosin proteins. And, it is the repeating units of each muscle fiber
5. Sacroplasmic reticulum stores calcium and regulates it release during muscle contraction and relaxation. It's is similar to endoplasmic reticulum of normal cell.
6. Plasma membrane of muscle cell is called as sacroplasm.
7. Myofibril is the rod like organelle.
8. T-tubule is the extension of the sacrolemma (plasma membrane).
9. Endomysium is the connective tissue that surrounds each muscle fiber
10. Each muscle fiber is a muscle fiber
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