Chapter 48: Musculoskeletal Systems Flashcards
skeletal muscle
responsible for all voluntary movements, and many involuntary actions
cardiac muscle
responsible for the beating of the heart
smooth muscle
creates movement in many hollow internal organs
under the control of the autonomic nervous system
muscle fibers
skeletal muscle cells
large with many nuclei
actin
thin filament, used for muscle contraction
myosin
thick filament
myofibrils
bundles of thick myosin and thin actin arranged in an orderly fashion
sarcomeres
repeating units of overlapping filaments of actin and myosin.
titin
largest protein in the body
runs right through a myosin bundle(from z line to z line)
each sarcomere is bounded by
z line
centered in the sarcomere is the..
a band, which contains all the myosin filaments
H zone and I bands are..
regions where actin and myosin filaments do not overlap in the relaxed muscle
tropomyosin
twisting around the actin chains
troponin
attached to tropomyosin at intervals
motor unit
a motor neuron and all of the fibers with which it forms synapses with
sacroplasm
muscle fiber cytoplasm