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Unformatted text preview: elastic components. No external movement. Concentric isotonic contraction- muscle shortens such as the biceps brachii shorten due to flexion of the elbow. Eccentric isotonic contraction- muscle lengthens such as controlled elbow extension when lowering an object where biceps brachii contract and lengthen while triceps brachii shorten. 2. Understand the following: Twitch- quick contraction-relaxation cycle caused by stimulus at or above threshold; total twitch time ~7-100 msec Wave summation- Tetanus- Incomplete: stimulation arrives before relaxation is complete, each contraction is superimposed on the previous Complete: no time for relaxation from previous contraction, just a single prolonged contraction 3. Understand the steps of a muscle contraction 4. Identify the structures (label) of a muscle (from myofilaments to muscle) 5. Identify the structures (label) of the neuromuscular junction...
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