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The time between application of a stimulus to a motor neuron and the beginning of a contracton The lag phase
The time of contaction Contraction phase
The time during which the muscle relaxes Relaxation phase
Where the muscle remains contracted eithout relaxing Tetany
The increase in number of motor units being activated Recruitment
When at rest they can't stockpile ATP but they can store another high-energy molecule Creatine phosphate
without oxygen Anaerobic respiration
with oxygen (more efficient) Aerobic respiration
The amount of oxygen needed in chemical reactions to convery lactic acid to glucose and to replenish the depleted stores of creatine phosphate stores in muscle cells Oxygen Dept
results when ATP is used during muscle contraction faster than it can be produced in the muscle cells Muscle fatigue
Equal distance Isometric
Equal tension isotonic
constant tension produced by muscles of the body for long periods of time muscle tone
contract quickly and fatigue quickly Fast-twitch fibers
contract slowly and are more resistant to fatigue Slow-twitch fibers
the most stationary end of the muscle origin
The end of the muscle undergoing the greatest movement insertion
the portion of the muscle between the origin and the insertion belly
muscles that work together to accomplish specific movements synergists
muscles that work in opposition to one another antagonists
muscle plays the major role in accomplishing the desired movement prime mover
raises the eye brows occipto frontails
closes eyelids orbicularris
the kissing muscle orbicularis
chewing muscle buccinator
smiling muscle zygomaticus
covers the angle of the lower jaw masseter
overlines the temporal bone temporalis
covers the anterolateral neck platysma
muscles on each sides of the neck sternodei domastoid
covers the upper part of the chest pectoralis major
deep muscles found between the ribs intercostal muscles
reinforces the body trunk muscles of the abdominal girdle
muscles of the posterior neck and upper trunk trapzius
flat muscle pair that covers the lower back latissimus borsi
a prime mover of back extension erector spinae
form the rounded shape of your shoulders beltoid
Created by: shelbygissel