EXPH exam 2
sarcoplasmic reticulum
Storage, release, and uptake of calcium
Transverse (T) tubules
Extension of sarcolemma - penetrate the muscle cells to spread action potential and cause SR to release calcium
sarcolemma
cell membrane surrounding muscle cells
mitochondria
organelle in cells that produce energy via cellular respiration
myofibril
component of skeletal muscle, composed of myofilament and sarcomeres
myofilaments
composed of actin and myosin
z disks
anchors neighboring sarcomeres to one another
actin filaments
thin filaments
myosin filaments
thick filaments
A band
contains both actin and myosin - doesn't change size with muscle contraction
H band
contains only myosin
I band
Contains only actin
troponin
regulatory protein that calcium binds to
tropomyosin
regulatory protein that blocks binding sites
medial
toward the midline
lateral
away from the midline of the body
inferior
toward the bottom
superior
towards the head
proximal
closer to the trunk, in reference to an extremity
distal
referencing the extremity, farther from the trunk
superficial
close to the surface
deep
away from the surface; underneath
anterior
towards the front of the body; ventral
posterior
towards the back of the body
transverse
dividing body into right and left (medial and lateral)
sagittal
dividing front and back (anterior and posterior)
frontal
dividing top and bottom