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Ch 6 Muscular System Review Part 1

Ch 6 Muscular System Review Part 1. 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.

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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

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