The Muscular System:Skeletal Muscle Tissue

The Muscular System: Skeletal Muscle Tissue Fill in the characteristics of the three muscle types: Muscle Type Cardiac Shape of cell Skeletal branching chains of cells single, long cylindrical # of nuclei 15 um in diamter, small Striations yes, has myofibrils and sarcomers Control involuntary 100 um In size, big Smooth single, spindle shape cells 2-10 In diameter, medium yes, presences of myoflbrilsno presence of myofibrils and sarcomeres voluntary tendons What attaches muscles to bone? 3. The whole muscle is composed of muscle cells (fibers) grouped in bundles called fascicles 4.
Name the connective tissue coverings surrounding the following: Whole muscle epimysium perimysium Fascicles endomysium Muscle cell 5. Match the following three terms with their definitions: 2 Sarcolemma Sarcoplasmic reticulum Cytosol 6. – endoplasmic reticulum in muscle cell 3 – intracellular fluid around organelles – plasma membrane of muscle cell Terminal cisternae T-tubules 2 Triad 1 7. – part of sarcolemma”carries action potential – part of sarcoplasmic reticulum”stores calcium ions Myofibrils consist of contractile proteins called
Name the two types and what they’re composed of: thin filaments composed of protien actin protien myosin thick filaments 8. . microfilaments Arrangement of myofilaments. Give the letter name of each band: Dark band ”+ A band Light band ”+ band Match two definitions with each band: – contains only thin filaments A contains defined by length of thick filament A defined 9. both thick and thin filaments as distance between two thick filaments Z line (disc) defined by length of thick filament, A band the H zones lies within the A band where the thick filaments are H zone 10.

What happens to these areas during contraction? the z- lines move close Z line (disc) H zone the h zone will lesson in width during the contraction 11. Define these two terms: this is a thin or a fine band that is dark and will cross over into the center of the M line A band and has striated fiber muscles are muscles that have two important filaments, thin and thick. they lie in between Sarcomere bands 12. the two z- Organization of muscle. Put the following components in order, from smallest to largest: 6 fascicle 2 muscle myofibril 4 myofilament 5 muscle 1 muscle fiber.

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