Study Guide 3

Study Guide 3 - elastic components No external movement...

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Study Guide Exam 3 1. Know the following terms Excitability (or irritability)- the ability to receive and respond to stimuli Elasticity- the ability to recoil and resume the original resting length Contractility- the ability to shorten forcibly Extensibility- the ability to be stretched or extended Conductivity - the ability to transmit an electrical impulse Origin- the attachment of a muscle that remains relatively fixed during muscular contraction Insertion- a moveable attachment of a muscle Prime mover (agonist)- muscle that bears the major responsibility for effecting a particular movement Antagonist- muscle that reverses, or opposes, the action of another muscle Fixator- muscle that immobilizes one or more bones, allowing other muscles to act from a stable base Synergist- muscle that aids the action of a prime mover by affecting the same movement or by stabilizing joints across which the prime mover acts to prevent undesirable movement Isometric contraction- muscle cells contract, but tension absorbed by series-
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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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Study Guide 3 - elastic components No external movement...

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