Chapter 10 HW A&P - Mills

muscle striations

compact protein arrangements in cell

cardiac muscle

striated and involuntary

skeletal muscle

multinucleated and voluntary

smooth muscle

lines body tubes

endomysium

areolar connective tissue around muscle fibers

sarcolemma

plasma membrane of myofiber

thick filaments

myosin

thin filaments

actin

satellite cells

regeneration of muscle fibers

glycogen

storage form of glucose

calcium ion bonding

troponin C

induction of muscle action potential

acetylcholine binding to receptor

heat production

majority of energy used in muscle hydrolysis of ATP

neuromuscular junction

synapse of axon and muscle cell membrane

myoglobin

binds oxygen in muscle

sliding filament theory

thin filament pulled toward center of sarcomere

refactory

nonresponsive to stimulus

tetanus

sustained contraction

motor unit

skeletal muscle fibers activated with one motor neuron

isometric contraction

muscle tension but no shortening

z-disc

demarks sacromere units

myosin

motor protein

myomesin

M line protein

dystrophin

attaches sarcomeres to sarcolemma

titin

myofibril elasticity and extensibility

acetylcholine

opens Na+ channels of muscle

pyruvate

product of glycolysis

electrons from glycolysis

pyruvate —> latic acid

glycolytic skeletal mucsle fibers

glycolysis but few mitochondria

tropomyosin at rest

blocking of myosin binding sites on actin

acetylcholine esterase

cleaves AcCh to end muscle contraction

gap junctions

communicates depolarization in cardiac and smooth muscle

intercalated discs

gap junctions and desmosomes in cardiac cells