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Muscular Systems (Names of the Muscles (list 20 and where they are)…
Muscular Systems
Names of the Muscles (list 20 and where they are)
Zygomaticus - Check Muscle
Tempordlis- Side of head muscle
Platysma - shoulder muscle
Sternocleidomastoid- neck muscle
Gluteus Maximus - Butt Muscle
Calcaneal- lower leg muscle
Trapezius - upper back muscle
Bicepts Femoris - Back of femur muscle
Latissimus Dorsi - Back muscle
Pectoralis Anterior - Breast Muscle
Gastrochemius- back of lower leg
Internal Oblique - Ab muscles
Deltoid- forearm mucle
Serratus Anterior - upper ab muscle
Gluteus Medius- Butt Muscle
Masseter- Lower check
Tricept Brachii - Tricept muscle
Orbicularis Oris - lip muscle
Rectus femoris- femur muscle
Bicepts Brachii - upper arm muscle
structure and organizational levels of the skeletal muscle
MUSCLE FIBERS- Enlogated multinucleated cell, has a banded appearance.
MYOFIBRIL - Complex organelle composed of bundles of myofilaments. Rod like contractile element. Occupy most of the muscle cell volume. Appeared banded and bands that are adjacent are aligned. Composed of sacromeres arranged end to end.
SACROMERE - A segment of a myifibril. The contractile unit, composed of myofiliments made up of contractile proteins
FACICLE - A portion of the muscle which discrete bundles muscle cells. It is segregated from the rest of the muscles by a connective tissue sheath.
Major Functions of the Muscular System
Heat Production
Posture
Produces Movement
3 Types of Muscle Tissues & Their Major Functions/Characteristics
CARDIAC TISSUE
FUNCTIONS: Contracts to pump blood
LOCATION: Heart
SMOOTH TISSUE
FUNCTIONS: Involuntary movement l, moves food, involuntary control or respiratory, moves secretions, regulates flow of blood in arteries by contraction.
LOCATION: Walls major organs and passageways
SKELETAL TISSUE
FUNCTION: Voluntary movement, produces heat, and protects organs
LOCATION: Attached to bones and around entrance point to body.
Physiology of Muscle Contraction
First the nerve impulse arrives at the Axon terminal of motor nueron and triggers a release of Ach. The ach diffuses across synaptic cleft which binds to its receptors in the motor end plate and triggers a muscle action potential. Then the ach in the synaptic cleft destroys ach so another muscle can action potential. Then the ach is released. Calcium binds to troponin on the thin filament exposing the binding sites for Myosin. The contraction occurs when ot uses ATP. After a while the muscle relaxes.