lecture exam 3 Flashcards
long, cylindrical, striated, multinucleated
skeletal muscle
short, spindled, non-striated, uninucleated
smooth muscle
short, branched, striated, uninucleated
cardiac muscle
functions of skeletal muscle
Maintain body temperature,Produce skeletal movements,Guard body entrances and exits, Support soft tissues, Maintain posture and body position, Provide nutrient reserves
Bundles of muscle fibers that are covered by the perimysium are known as
Fascicles
The connective tissue sheath that surrounds individual muscle cells is known as
Endomysium
The cell membrane of a muscle cell that surrounds the sarcoplasm is known as the
Sarcolemma
Lengthwise subdivisions within muscle fibers that are made up of bundles of protein filaments
Myofibrils
Thin filaments are made primarily of?
actin
thick filaments are made primarily of ?
myosin
Transmit action potential through cell and allow entire muscle fiber to contract simultaneously
T-tubules
what are Cisternae responsible for?
Concentrating Ca2+ (via ion pumps) and releasing Ca2+ into sarcoplasm to begin muscle contraction
strands of proteins that reach from tips of thick filaments to the Z line and stabilize the filaments
Titin
myosin filaments of muscle fibers slide past the troponin filaments during muscle contraction, while the two groups of filaments remain at relatively constant length
sliding filament theory
The role of troponin within the myofilament is?
bind tropomysoin over active site
The typical resting membrane potential is?
-70 mV
Compared to the cytosol, the ECF is ___________ in Na+ and _____________________
Higher, slightly positive
ATP can be generated from which precursors?
Creatine Phosphate, Pyruvate/Pyruvic Acid, Glycogen, Fatty Acids
Muscle hypertrophy can be characterized by?
Myofibril diameters increase, Muscle size increase
Muscle atrophy can be characterized by?
Muscle size decrease, Muscle fiber death
Rigor Mortis can be characterized by?
Depletion of ATP maintains actin – myosin cross-bridges, General muscle contraction following death
Origins are?
fixed
insertions are ?
moveable
Chiefly responsible for a movement
agonist