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What are the basic functions of the muscular system?
1. Move Skeleton 2. Movement of substance through body. 3. Breathing 4. Production of heat for conastant body temperature.
What is the incertion Point?
The more movible portion of the muscle
What is the origin?
The Less movible part.
What are muscles specialized for?
Contraction
What are the two general arrangements?
Antagonists and Synergists.
What is proprioception?
The brain knowing where the muscles are and what they are doing as a result of muscle sense.
What is Isometric?
Muscles contracting but not becoming shorter.
What is the function of the sarcolemma?
Acts as plasma membrane.
What lateral boundries do the z disccs make up?
The sacromere.
What is a sacromere?
The contractal unit of the muscle.
What are myofibrials made of?
Several Contracting units called sacromeres.
What are sacromeres made up of?
Myofilaments called myosin and actin.
What is Mysoin?
The Thick Filiments
What is Actin?
The Thin Filiments
What are the contracile proteins of muscle fiber?
Actin and Myosin.
What two inhibitory proteins are associated with contraction?
Troponin and Tropomyosin
How does contarction proceed?
Via Sliding Filament Mechanism.
What are the first 3 steps in the sliding filimanet mechanism?
1. Nerve Impulse reaches the neromuscular junction and realseases Ach 2. Ach Causes the sarcolemma to release Ca Ions 3. Ca Ions bond to the troponin causes conformational change of tropmyosin complex and shift it away from the actin filiment exposing binding sites.
What are the next Steps?
4. Myosin Head binding sight on actin now exposed. 5. A cross bridge is now formed between the actin and myosin filiments. 6. Energy from ATP allows mysoin to pull the actin toward the center of the sarcomere 7. Contraction of a muscle fiber is all our none.
What gets shorter during muscle contraction?
The space between actin, space between filiments, and space between discs.
Flexion
To decrease the angle of a joint.
Extension
To increase te angle of a joing
Abduction
To move away from the midline
Adduction
To move closer to the midline
Pronation
To turn the palm down
Supination
To turn the palm up
Dorsiflexion
To elevete the foot
Plantar Flexion
To lower the foot (point toes)
Rotation
To move bone around its longitutidnal axis.
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