Unit 5 Muscular System
Terms in this set (47)
What are the four muscle characteristics
Contractility, extensibility, elasticity, and excitability.
Ability of muscle tissue to shorten and produce force.
Ability of muscle tissue to be stretched with little force from opposing muscle.
Ability for muscle tissue to return to its normal state.
Ability to receive and respond to stimuli.
What are the four basic functions of the muscular system
Motion, maintenance of posture, heat production (add one)
Voluntary, striated, and attached to bone.
Involuntary, striated and located on the heart.
Involuntary, no striated, and located in blood vessels, stomach, and intestines.
Muscular connective tissue in a cord like form.
A nerve cell that stimulates muscle.
the end of an axon terminal where it attaches to muscle fiber.
The neurotransmitter released from the synaptic vesicle that initiates an action potential.
Motor end Plate
The area of muscle membrane directly under an axon terminal of a motor neuron.
A motor neuron and all muscle fibers it innervates.
Sliding Filament Theory
The actin and myosin myofilaments slide past one another shortening the sarcomere.
Attachment of a muscle, or tendon to the stationary bone.
Attachment of a muscle, or tendon to the movable bone.
A muscle that causes a desired action.
The muscle which has an opposite effect to that of the prime mover.
A muscle which serves to steady a movement preventing unwanted movements; helps the prime mover be efficient.
Muscle which stabilizes the orgin of the prime mover.
What would happen if the flexors of your forearm were functional, but not the antagonistic extensors?
Your arm would flex, but you would be unable to relax and extend.
What action would occur if both the flexors and extensors contracted simultaneously?
No action would occur. There would be no movement at the elbow joint.
Covers most of the posterior of the humerus.
Largest muscle of the chest region; used to throw a ball in the air and to adduct arm.
Bows and rotates head from side to side.
Triceps Brachii (2)
Controls action at the elbow for a movement such as the down stroke in hammering a nail.
Flexes the forearm.
Hyper extends the humerus, as in doing the "crawl" swimming stroke.
Moves shoulders by raising them and pulling them back, helps hold head.
Abducts the arm.
Consist of four heads: rectus femoris and three vastus muscles (lateralis, medialis, and intermedius.)
This muscle group includes three separate muscles: biceps femoris, semitendinuous, and semimembranosus. It is the antagonist to quadriceps femoris.
Large muscle mass of the buttocks; extends and rotates the thigh laterally.
A posterior muscle located in lower leg the leg, it form the "calf." Attaches to the calcaneus by the Achilles Tendon.
Triceps Brachii (3)
Posterior aspect of the upper arm, it extends the forearm.
Biceps Brachii (2)
Anterior aspect of the upper arm, it flexes forearm.
Anterior aspect of the neck, it flexes the head and neck.
Covers shoulder, it abducts the arm.
Pectoralis Major (2)
Chest, adducts the arm.
Superficial muscle of the thoracic and lumbar region of the back, it extends a flexed arm or hyperextends the arm from the anatomical position.
Separates the thoracic and abdominal cavities, Deflects diaphragm inferiorly, increasing thoracic cavity volume.
Posterior aspect of the lower leg, planter flexes the foot.
Hamstring muscle group
Posterior aspect of the thigh, it flexes lower leg.
Anterior aspect of the thigh, extends lower leg.
Buttocks region, it extends a flexed thigh or hyperextends the thigh from the anatomical position.
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