David_Lab4.labex12_13 - Krystal David Professor Jedlicka...

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Krystal David 3/23/17 Professor Jedlicka BIOS195 A. Skeletal Muscle Structure Number the following nestled, cylindrical structures in order from largest (1) to smallest (5). 4) myofibril 2) fascicle 5) filaments 3) muscle fiber 1) muscle B. Skeletal Muscle Structural Terms Identify the structure that matches the description. Perimysium 1.Connective tissue covering surrounding a fascicle T-tubules 2.Finger-like invaginations of plasma membrane; extend into interior of fiber and surround myofibrils Sacrolemma 3.Plasma membrane of skeletal muscle fiber Epimysium 4.Connective tissue covering surrounding the muscle Sarcomere 5.Smallest contractile unit within individual muscle fibers Sarcoplasmic Reticulum 6.Stores calcium within muscle fiber Endomysium 7.Connective tissue covering surrounding individual muscle fibers Triad 8.Two terminal cisternae and a T tubule Myofibils 9.Rod-like structures within skeletal muscle fiber that contain thin and thick filaments organized into sarcomeres C. Sarcomere Structure and the Sliding Filament Mechanism of Contraction Write the name of the sarcomere structure defined. A structure may be used more than once, and a definition may apply to more than one structure. Thick and thin filaments 1.Length does not change when sarcomere shortens. A band 2.This area is the length of thick filaments. M line 3.Center point of attachment for thick filaments. I bands and H zone 4.Length decreases when sarcomere shortens.
I band 5.This area contains only thin filaments. Z disc 6.Point of attachment for thin filaments. H Zone 7.This area contains only thick filaments. Zone of overlap 8.This area contains overlapping thin and thick filaments. Sarcomere

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