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Ch 6 Muscular System Review Part 1

Ch 6 Muscular System Review Part 1

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Ch 6 Muscular System Review Part 1

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  1. Ch 6 Muscular System Review Part 1

  2. 4 Major Features of the Sarcomere • Highly ordered repeating units of actin and myosin • Basic structural and functional unit of skeletal muscle • Smallest portion of skeletal muscle capable of contracting • Extends from z disk to z disk

  3. Describe what happens to the parts of a sarcomere during contraction A band No change I band Shortens H zone Disappears Z disk Moves towards center of sarcomere

  4. C D B B A

  5. Functions of the Muscular System • Produces movement • Maintains posture • Stabilizes joints • Generates heat • Circulates blood and maintains blood pressure • Forces substances through channels

  6. Describe the following terms • Acetylcholine Neurotransmitter b. Acetylcholinesterase Enzyme that breaks down Ach c. ATP Energy required for movement for contraction d. Ca2+ Ion necessary for muscle contraction e. Cross bridge When myosin head attaches to actin f. I band Light band; only actin g. Motor unit All the muscles that a nerve stimulates h. Synaptic cleft Gap between nerve & muscle • Tendon Connective tissue that attaches bones to muscles

  7. Describe the following j. Thick filament Myosin k. Thin filament Actin l. Lactic acid Its build up causes muscle to fatigue & soreness

  8. 4 Characteristics of skeletal muscle • Contractibility • Excitability • Elasticity • Extensability

  9. 3 Muscle Types