Unit 3 Lesson 5
Every skeletal muscle is attached to bone
false
Fascicle
group of muscle fibrils
Fixator
holds non-moving bones in place during an action
Myosin
in midde of sarcomere bracketed by actin
Smooth
involuntary, GI tract, arrector pili, blood vessels, respiratory tract
Thin filament
Actin
Perimysium
CT around fascicles
Endomysium
CT around muscle fibers
Levels of muscle membranes
Epimysium, perimysium, endomysium
Troponin
a Ca++ binding protein that is on tropomyosin
Myofilaments
actin and myosin
Z disk
actin is bound to this, marks the outer boundary of a sarcomere
Antagonist
acts opposite of the prime mover
Synergist
aids the agonist stability
Actin
attached to z-disk and brackets myosin
Flexion of the elbow synergist
biceps brachii
Origin
bone that muscles tendon attaches to that remains stationary during movement
Flexion of the elbow agonist
brachialis
Tendon
connects epimysium to the periosteum
Tropomyosin
covers active sites of actin so myosin heads can't contact them
Epimysium
dense irregular CT around muscles
Prime Mover
muscle that produces the most force in an action
Thick filament
myosin
Extrinsic
palmaris longus muscle
Sarcolemma
plasma membrane of muscle fiber
Sarcomere
region between two z disks
I band
region of myofibril where there is no myosin, light striation
H band
region of sarcomere where myosin is located without actin
A band
region of sarcomere where myosin is located, dark striation
T tubules
regions of sarcolemma that dip deep into the muscle fiber
Flexion of the elbow fixator
rhomboids
Muscle fiber
skeletal muscle cells
SR
specialized smooth ER that stores and releases Ca++
Cardiac
striated, involuntary, intercalated disks
Skeletal
striated, voluntary
Flexion of the elbow antagonist
triceps brachii