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Musculo-skeletal Sys

SUPA Bio 123

TermDefinition
Tetanus a state where muscle fibers are continually stimulated, creating sustained muscle contraction
Skeletal muscle muscles attached to bones that aid in locomotion
Smooth muscle muscle that lines organs such as the stomach and intestines
Cardiac muscle specialized striated muscle that can create its own rhythmic depolarization without nervous system input
Myofibrils a bundle of skeletal muscle, consisting of thick and thin filaments
Thin filaments strands of fibers made of actin protein
Thick filaments strands of fibers made of myosin protein
Sarcomere the basic contractile unit of skeletal muscle. Contains sliding filaments of actin and myosin, which give skeletal muscle its striated appearance
Ca+2 ion that plays an important role is skeletal muscle contraction
Increased Ca+2 levels exposes myosin binding sites of the sarcromere, allowing filaments to slide and the muscle to contract.
Decreasing Ca+2 levels cover the myosin binding sites of the sarcomere, stopping muscle contraction
Motor unit single motor neuron + the muscle fibers it innervates (controls)
Cranium main bone in the skull
Scapula shoulder blade
Clavicle ventral bone, connecting the sternum to the shoulder joint. It’s thin and the most easily broken bone in the body
Humerus upper arm bone
Ulna lower arm bone. When shaking hands it’s on the bottom
Radius lower arm bone. When shaking hands it’s on the top
Carpals wrist bones
Metacarpals hand bones (not including fingers)
Phalanges finger and toe bones
Femur strongest bone in the body, located in the upper leg
Patella knee cap
Tibia shin bone, in lower leg
Fibula smaller bone in lower leg
Tarsals ankle bones
Metatarsals foot bones (not including toes)
Ball an Socket Joint type of joint in shoulder and hip
Hinge Joint type of joint in elbow between the humerus and ulna. Only moves one way
Pivot Joint joint between the radius and ulna, and also in between the skull and top vertebrae. It allows turning
Created by: PRO Teacher etucci
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