Topic 9. Myology assignments.pdf

If threshold is reached gated channels on adjacent

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junctional folds) and as such it is a _________ potential known as EPSP. If threshold is reached, ______-gated channels on adjacent sarcolemma will open and an action potential will be generated in the muscle cell. Assignment 5-review. Number the following statements in their proper order (1-12) to describe the contraction mechanism in a skeletal muscle cell. The first step was already identified. 1 Ach is released into the neuromuscular junction by the axonal terminal. Voltage-gated channels on SR open and Ca++ ions diffuse into the sarcoplasm The muscle cell relaxes and lengthens. Threshold is reached and action potential is generated. Myosin binding sites on actin are exposed The Ca++ ions concentration at the myofilaments increases The myofilaments slide along each other and the cell contracts. Sodium influx depolarizes the membrane of the skeletal muscle cell. Ca++ ions are pumped back into the sarcoplasmic reticulum, as acetylcholinesterase breaks down Ach Myosin head attaches to actin Action potential travels away from NMJ on surface of sarcolemma and then down the T-tubules. Ca++ ions attach to troponin and tropomyosin shifts away Assignment 6-review. Complete the statements choosing the correct response from the key choices: motor unit, isotonic contraction, few motor units, threshold stimulus, isometric contraction, subthreshold, fatigue, tetanus, many motor units, maximum, minimal. 1. _____________ is a continuous contraction that shows no evidence of relaxation. 2. A(n) __________is a contraction in which the muscle shortens and work is done. 3. To accomplish a strong contraction ______________ are stimulated at a rapid rate. 4. When a weak muscle contraction is desired, ______________are stimulated.
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  • Spring '11
  • Sturges

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