Muscle physiology
Quiz yourself by thinking what should be in
each of the black spaces below before clicking
on it to display the answer.
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| show | a neuron
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| what is the name of the junction between axon terminal and motor end plate? | show 🗑
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| show | the end of an axon
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| show | vessicles within the axon terminal that contain the neurotransmitter ACh which gets the message from neuron to muscle cell
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| show | acetocholine
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| show | the space between the axon terminal and motor end plate
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| what is the motor end plate? | show 🗑
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| what is it called when there is a charge difference? | show 🗑
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| show | Na+ (sodium ions)
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| show | K+ (potassium ions)
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| show | although there is an abundance of K+ on the inside, there is still more sodium ions on the outside, therefore, there is a difference in the charges
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| show | muscle and nerve
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| show | maintain
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| show | there is a change in the permeablity in the membrane so sodium ions go to the bottom and potassium ions go to the top
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| show | one; switch; switch
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| the "switch" during action potential is really what? | show 🗑
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| what is action potential? | show 🗑
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| what is the first step for excitation-contraction coupling? | show 🗑
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| what is the second step for excitation-contraction coupling? | show 🗑
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| what is the 3rd step for excitation-contraction coupling? | show 🗑
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| show | the attachment to the motor end plate allows the action potential to travel along the sarcolemma and once it gets to the t tubles it changes the permeablity in the terminal cisternae and allows them to release Ca+
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| show | calcium binds to troponin and tropomyosin
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| show | cross bridges flip up and connect to actin and cause it to slide toward the H zone
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| show | acetylcholinesterase stops contraction
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| show | broken down glucose
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| show | ADP
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| show | energy and the ability to do work is prsent
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| ATP is stored in | show 🗑
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| show | breaks attachment
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| show | energized myosin head attaches to actin and forms a cross bridge
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| what is the second step of the cross bridge attachement? | show 🗑
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| what is the power stroke? | show 🗑
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| show | ATP attaches to myosin and the link between actin and myosin weakens and myosin head detaches
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| what is the 4th step of the cross bridge attachment? | show 🗑
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| show | force buliding up in muscle (inside the muscle)
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| show | what is being moved (outside the muscle)
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| what is isotonic contraction? | show 🗑
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| what is isometric contraction? | show 🗑
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| show | the whole muscle
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| what does the motor unit include? | show 🗑
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| show | only 1
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| How many motor units and axon terminals can an axon have? | show 🗑
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| How do we maintain tone? * | show 🗑
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| what is a myogram? | show 🗑
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| what is a twitch? | show 🗑
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| What is the lag phase in a myogram? | show 🗑
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| show | building up of muscle tension; the # of myosin & actin bonds begin to increase until it reaches maximum contraction
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| show | period of relaxation
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| show | differently
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| what is graded muscle response? | show 🗑
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| contraction strength can change only by: | show 🗑
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| show | how many times stimulus is applied
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| what is stimulus intensity? | show 🗑
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| in low stimulus frequency contraction, the stimulation is: | show 🗑
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| what is wave summation? | show 🗑
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| show | because it adds stimulation before the contraction can finish
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| show | greater
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| in high stimulus frequency contraction the stimuation is: | show 🗑
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| show | because the stimulus is applied before the contraction has time to begin to undo itself
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| what causes muscle to fatigue | show 🗑
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| a change in stimulus intensity is generally measured in what? | show 🗑
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| more and more motor units begin to be _____ with increase of intensity | show 🗑
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| show | the point at which there is a first response to the buliding intensity of stimulus
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| what is the lowest intensety that will genereate a response from a muscle called? | show 🗑
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| show | intensity applied before threshold that is too weak to generate a response
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| what is maximal stimulated intensity? | show 🗑
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| the more and more intensity added after threshold, the more ___ are filled to capactiy | show 🗑
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| show | because all of the motor units have been engaged
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