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The Muscular System Kennedy Abraham Per.5 (Names of Muscles (deltoid,…
The Muscular System Kennedy Abraham Per.5
3 types of Muscle Tissue and major functions
Cardiac Muscle: Cells are branched and has single central nucleus, and are joined to another cell at intercalated disc
Smooth Muscle: Has no striation and appears smooth, and controls movement inside internal organs
Skeletal Muscle: Cells are long, multinucleated, and are attached by tendons to bones.
Body movement Terminology
Prime mover- contraction is mainly responsible for movement
Synergist- helps primary mover
extension increases the angle between 2 bones
antagonist- oppose the action of a prime mover
flexion decreases the angle between 2 bones
as muscles contracts it pulls insertion bone closer to origin bone
Structure and organization of skeletal muscle
Body- main part of the muscle
Tendons- strong cords of fibrous connective tissue that attaches muscle to bone
Insertion- end of a muscle attached to the bone that moves when a muscle occurs
Ligaments- strong cords of fibrous connective tissue that attaches bone to bone
Origin - end of a muscle that attaches to the bone but does not move when contraction of the muscle occurs
Bursae- synovial-lined sacs containing synovial fluid
Names of Muscles
deltoid
biceps brachii
stemocleidomastoid
masseter
Tibialis
frontal
rectus femoris
zygomaticus
vastus lateralis
Orbicularis oris
fibularis longus
Temporalis
trapezius
external oblique
gluteus medius
adductor magnus
Physiology of muscle contraction
Myosin attaches to actin
Myosin head moves toward M-line
Ca++ binds the actin myofilament, exposing the myosin binding site
Repeated many times powered by ATP
Nerve impulse travels down sacrolema
Z lines get closer together