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Muscle Contraction

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					Name
Date
Period
                                          The Muscular System




Muscle Contraction
Number the following statements in their proper sequence to describe the contraction mechanism in a
skeletal muscle cell.

____ 1. The action potential triggers the release of calcium, which attaches to myofilaments.

____ 2. The nerve impulse moves through the nerve cell to the axon.

____ 3. Acetylcholine diffuses across the synaptic cleft.

____ 4. Acetylcholine is released.

____ 5. The sacrolemma temporarily allows sodium ions into the cell.

____ 6. The muscle cell shortens and a contraction takes place.

____ 7. The muscle cell becomes positively charged changing the condition of the sacrolemma.

____ 8. An action potential is created.

____ 9. Acetylcholine attaches to receptors on the sacrolemma.

Matching

Origin               antagonist           contractibility     isotonic
Insertion            lactic acid          excitability        isometric
Body                 synergist            extensibility       atrophy
Prime mover          action potentials    elasticity          hypertrophy



   1. ______________________ muscle shortens or contracts, reducing the distance between an
      angle.
   2. ______________________ ability to respond to a stimuli.
   3. ______________________ electrical signal
   4. ______________________ ability to be stretched.
   5. ______________________ ability to return to original position
   6. ______________________ part of the muscle attached to the bone
   7. ______________________ part of the muscle that moves most during a contraction; attached
      to a moveable part.
   8. ______________________ central portion of the muscle
9.    ______________________ produces movement in a single direction
10.   ______________________ produces movement in the opposite direction of another muscle
11.   ______________________ accumulation causes muscle fatigue
12.   ______________________ when muscles contract and shorten
13.   ______________________ tension in muscle increases but muscle does not shorten
14.   ______________________ muscles shrink from disuse
15.   ______________________ muscles become enlarged

				
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posted:3/2/2013
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