PSIO EXAM 3 QUESTIONS AND ANSWERS
functions of skeletal muscle (4) - CORRECT ANSWER✅✅locomotion, facial expression, posture and body
position, regulation of body temperature
muscles _____ on bones - CORRECT ANSWER✅✅pull
origin - CORRECT ANSWER✅✅muscle attachment to a relatively fixed structure
insertion - CORRECT ANSWER✅✅muscle attachment that moves (towards the origin for the most part)
reverse muscle action - CORRECT ANSWER✅✅the origin moves towards the insertion
first class lever - CORRECT ANSWER✅✅e, f, l (jaw)
second class lever - CORRECT ANSWER✅✅f, l, e (ball of foot)
third class lever - CORRECT ANSWER✅✅f, e, l, most common (elbow)
flexion - CORRECT ANSWER✅✅decrease in joint angle
extension - CORRECT ANSWER✅✅increase in joint angle
abduction - CORRECT ANSWER✅✅move away from midline
adduction - CORRECT ANSWER✅✅move toward midline
agonist - CORRECT ANSWER✅✅prime mover
, antagonist - CORRECT ANSWER✅✅opposition
synergist - CORRECT ANSWER✅✅assist agonist
fixator - CORRECT ANSWER✅✅type of synergist, stabilizes origin
covering of muscle fibers - CORRECT ANSWER✅✅endomysium
covering of fascicles - CORRECT ANSWER✅✅perimysium
covering of muscles - CORRECT ANSWER✅✅epimysium
hypertrophy - CORRECT ANSWER✅✅increase in cell size
functional unit of contraction - CORRECT ANSWER✅✅sarcomere
sarcolemma - CORRECT ANSWER✅✅plasma membrane of a muscle fiber
sarcoplasmic reticulum - CORRECT ANSWER✅✅stores Ca, surrounds myofibrils
z discs - CORRECT ANSWER✅✅anchor thin filaments
thin filament composition - CORRECT ANSWER✅✅actin, troponin, tropomyosin
thick filament composition - CORRECT ANSWER✅✅myosin
m line - CORRECT ANSWER✅✅anchors thick filaments
functions of skeletal muscle (4) - CORRECT ANSWER✅✅locomotion, facial expression, posture and body
position, regulation of body temperature
muscles _____ on bones - CORRECT ANSWER✅✅pull
origin - CORRECT ANSWER✅✅muscle attachment to a relatively fixed structure
insertion - CORRECT ANSWER✅✅muscle attachment that moves (towards the origin for the most part)
reverse muscle action - CORRECT ANSWER✅✅the origin moves towards the insertion
first class lever - CORRECT ANSWER✅✅e, f, l (jaw)
second class lever - CORRECT ANSWER✅✅f, l, e (ball of foot)
third class lever - CORRECT ANSWER✅✅f, e, l, most common (elbow)
flexion - CORRECT ANSWER✅✅decrease in joint angle
extension - CORRECT ANSWER✅✅increase in joint angle
abduction - CORRECT ANSWER✅✅move away from midline
adduction - CORRECT ANSWER✅✅move toward midline
agonist - CORRECT ANSWER✅✅prime mover
, antagonist - CORRECT ANSWER✅✅opposition
synergist - CORRECT ANSWER✅✅assist agonist
fixator - CORRECT ANSWER✅✅type of synergist, stabilizes origin
covering of muscle fibers - CORRECT ANSWER✅✅endomysium
covering of fascicles - CORRECT ANSWER✅✅perimysium
covering of muscles - CORRECT ANSWER✅✅epimysium
hypertrophy - CORRECT ANSWER✅✅increase in cell size
functional unit of contraction - CORRECT ANSWER✅✅sarcomere
sarcolemma - CORRECT ANSWER✅✅plasma membrane of a muscle fiber
sarcoplasmic reticulum - CORRECT ANSWER✅✅stores Ca, surrounds myofibrils
z discs - CORRECT ANSWER✅✅anchor thin filaments
thin filament composition - CORRECT ANSWER✅✅actin, troponin, tropomyosin
thick filament composition - CORRECT ANSWER✅✅myosin
m line - CORRECT ANSWER✅✅anchors thick filaments
