Free Printable Muscle Coordination and Contraction

Worksheets

Muscle Coordination and Contraction

Total questions: 10

Worksheet time: 10mins

Name

Class

Date

The (a) refers to where the muscle attaches to bone but does NOT move or moves less.

The (a) 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 (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

10.

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).