muscles Flashcards
skeletal muscle fiber
made up of smaller microscopic units called sarcomeres
sarcolemma
plasma membrane of a muscle fiber
sarcoplasma
cytoplasm of a muscle fiber
myoglobin
red pigment in muscles to carry oxygen
epimysium
outer most covering of dense connective tissue, encircle entire muscle (top)
perimysium
wrapping around the fascicle, dense irregular tissue (middle)
endomysium
wrapping of areolar connective around muscle fiber
sarcoplasmic reticulum
found around each myofibril
contractile protein
actin + myosin
tropomyosin + troponin
regulatory proteins; regulate the contraction + relaxation
vesicle
membraneous sac filled w/ stuff
“MYO”globin
transports oxygen to muscle cells specifically mitochondria to produce ATP in cell respiration
Thick
Myosin
Thin
Actin
Exocytosis
form of active transport
Acetylcholine (ACh)
neurotransmitter
Ca
Calcium ions
Na
Sodium ions
K
Potassium ions
Three types of muscles
smooth, cardiac, and skeletal
Sarcomere
unit of muscle contraction is made up (laments > actin + myosin)
z line to z line
one sarcomere length
m line
marks the middle of sarcomere
h zone
takes in ONLY thick (myosin)
a band
takes in entire myosin length
i band
takes only the actin w/ no myosin overlap
sliding filament
actin + myosin DO NOT change in length, just slide towards m line
skeletal muscles
attached to bone by tendons; in movement, one bone stays stationary + the other moves
