Flashcards in MUSCULAR SYSTEM (2) Deck (41):
involuntary muscles found in the walls of hollow internal organs
involuntary muscles found only in the heart wall
voluntary muscles attached to the skeleton (antagonist- works in pairs)
connective tissue that connects muscle to the bone
attachment of the muscle on a stationary bone
attachment of a muscle on a bone that moves
)makes up the buttocks and is the largest muscle) extends thigh to form buttocks
(shaped like a triangle) abducts and raises arm at shoulder point
longitudinal muscle of the abdomen (flexes spine)
extends head; raises and abducts shoulders dorsally
compresses abdomen; rotates trunk
flexes and adducts should and arm ventrally (pulls arm across chest)
extends and adducts shoulder and arm dorsally (pulls arm across back)
rotates thigh (sitting cross-legged)
a cell containing the usual cell components
skeletal muscle contraction
1. nerve impulses travel down motor neurons and stimulate muscle fibers at neuromuscular junctions
2. when Ca2+ are released into muscle fibers, actin filaments slide past myosin filaments
3. synaptic vesicles release Ach which binds to protein receptors causing Ca to leave the sarcoplasmic reticulum and myofibril contraction follows.
a single contraction that lasts only a fraction of a second
increased muscle contraction until maximal sustained contraction is reached
maximal sustained contraction
a continuous slight tension maintained by muscle fibers that take turns contracting
twisting of a joint involving muscles, ligaments, tendons, blood vessels, and nerves
an injury that causes over stretching of a muscle near a joint
inflamed tendon like tennis elbow
inflamed bursa (cortisone injections)
progressive degeneration and weakening of muscles
autoimmune disease characterized by weakness that affects the muscles of the eyelids, face, neck, and extremities
achy muscles due to injury or infection
movement is essential to maintaining
muscles that work in opposite pairs
muscles working in groups for a common action
actin and myosin are
Saclike, fluid- filled structures, lined with synovial membrane, that occurs near a joint.
One of two major proteins of muscle; makes up thin filaments in myofibrils of muscle fibers.
One of two major proteins of muscle; makes up thick filaments in myofibrils of muscle fibers.
Protein that functions with troponin to block muscle contraction until calcium ions are present.
ATP (adenosine triphosphate)
Nucleotide with three phosphate groups. The breakdown of ATP into ADP + P makes energy avail-able for energy- requiring processes in cells.