A&P 1 chapter 10
Striated, involuntary muscle found only in the heart
Involuntary, non striated muscle that controls movement of internal organs
striated, voluntary, fornd attached to bones
(multinucleated), One single muscle tissue cell. Has its own components that make a cell.
the actions of muscles
1.pull 2 bony points closer together
2. acts as a sphincter
3. pull on skin
fine areolar connective tissue surrounding each muscle fiber
Bundle of muscle fibers bound together by a connective tissue sheath.
connect muscle to bone
A single long cylindrical muscle cell that contains many nuclei
the plasma membrane sheath enveloping a muscle fiber
the cytoplasm of a striated muscle fiber
transverse tubule system
(T tubules), ...is continuous with the sarcolemma - invaginates perpendicular to sarcomlemma
Micorsopic, fiber-like structures that occupy most cytoplasm in skeletal muscle cells
made of several hundred myosin molecules; shaped like a golf club
filament composed of actin, troponin and tropomyosin
Specialized from of Endoplasmic reticulum, stores Calcium Ions
enlarged areas of the sarcoplasmic reticulum surrounding the transverse tubules, which store calcium for release at the start of muscle contraction
complex of three units in a muscle fiber made of T tubules and sarcoplasmic reticulum terminal cisterns on both sides of it
release and sequestration
the smallest contractile unit of muscle: extends from one z disc to the next
(M=middle), line of protein myomesin that holds adjacent thick filaments together
boundary between adjacent sacromeres.
The regulatory protein blocking myosin-biding sites on the thin filament while a muscle is at rest
(binds Ca2+), moves tropomyosin aside & exposes myosin binding sites when Ca+ is released
myosin head, which connects thick filaments and thin filaments during a contraction
pivoting of myosin heads attached to actin
sliding filament theory
theory that actin filaments slide toward each other during muscle contraction, while the myosin filaments are still
nerve impulse (motor)
the junction between a nerve fiber and the muscle it supplies
enables muscle action, learning, and memory
motor end plate
the flattened end of a motor neuron that transmits neural impulses to a muscle
muscular stiffening that begins 2 to 4 hours after death and last for about 4 days
muscle contraction that results in limb movement(muscle length changes)
(no muscle length changes), "same measurement"; tension in the muscles increases; the muscle is unable to shorten; EX: pushing against a wall
enzyme makes creatine phosphate + ADP into ATP
METABOLISM THAT CAN PROCEED ONLY IN THE PRESENCE OF OXYGEN.
breakdown of glucose to pyruvic acid+2ATP production.
lactic acid converted to pyruvic acid in the liver
Rings that provide a strong connection between cardiac muscle cells, to prevent tears and leaks in the heart.
electron-dense portions of smooth muscle which thin filaments bind.