Muscle Types
Voluntary, striated muscle attached to bones.
skeletal muscle
Connective tissue around a muscle fiber
endomysium
thin filament protein
actin
Neurotransmitter released at NMJ.
acetylcholine
One neuron and all fibers it controls
a motor unit
Involuntary, striated muscle of the heart.
cardiac muscle
Connective tissue around a fascicle
perimysium
thick filament protein
myosin
Structure that stores calcium in muscle cells.
the sarcoplasmic reticulum
The three phases of a muscle twitch.
latent, contraction, and relaxation
Involuntary, non-striated muscle in organs.
smooth muscle
Connective tissue around the entire muscle.
epimysium
Protein that binds calcium to regulate contraction
troponin
Tubules that carry signals into the fiber.
t-tubules
Sustained contraction from rapid stimulation.
tetanus
Muscle type responsible for pumping blood
cardiac muscle
The cell membrane of a muscle fiber
the sarcolemma
Protein that blocks binding sites on actin
tropomyosin
The process linking nerve signal to contraction
excitation-contraction coupling
Energy system using oxygen for ATP.
aerobic respiration
Muscle type responsible for peristalsis
smooth muscle
The contractile unit of muscle
sarcomere
Interaction between these filaments causes contraction
actin and myosin
The cycle of attachment, power stroke, detachment, reset
cross-bridge cycle
Slow, fatigue-resistant muscle fibers.
Type I fibers