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10 questions
The __________ refers to where the muscle attaches to bone but does NOT move or moves less.
The __________ refers to where the muscle attaches to bone and causes movement.
__________ are "helper muscles" as they assist with doing work and stabilize joints against dislocation.
Synergists
Prime movers
Agonists
Antagonists
A __________ consists of a group of muscle fibers that all get their signals from the same single motor neuron. As a result, all muscle fibers act together as a unit.
__________ motor units are found in muscles that perform precise or fine movements. Examples would be those found in the eyes and fingers.
Small
Large
Mixed
A(n) ____________________ is a single stimulus-contraction-relaxation sequence in a muscle fiber. It is a single, short contraction involving only a few motor units.
twitch
origin
recruitment
antagonist
In a single muscle twitch, the ____________________ occurs when calcium (Ca2+) is being pumped back into the sarcoplasmic reticulum (SR) and actin and myosin stop the binding cycle.
latent period
contraction phase
relaxation phase
In a single muscle twitch, the ____________________ occurs immediately after a muscle fiber has been stimulated by a nerve. Calcium (Ca2+) is released from the sarcoplasmic reticulum (SR). The stimulus has arrived, but NO force/tension is being produced. This is the SHORTEST phase of a single muscle twitch.
latent period
contraction phase
relaxation phase
The image shown is an example of ____________________. This occurs if a second stimulus arrives IMMEDIATELY AFTER the RELAXATION phase has ENDED. The resulting contraction will have a slightly higher tension than the first contraction. Tension rises in stages (like a staircase, hence its name).
treppe
wave (temporal) summation
complete tetanus
incomplete tetanus
The image shown is an example of ____________________. This happens when another action potential (stimulus) occurs BEFORE the muscle is able to RELAX (before the relaxation phase). MORE calcium (Ca2+) is released resulting in MORE binding sites being revealed. As a result, MORE force is generated in that muscle fiber. In this case, twitches add to each other (get closer together in time).
treppe
wave (temporal) summation
complete tetanus
incomplete tetanus
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