Skeletal Muscle Parts

21 terms by rebeldancer194

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epimysium

connective tissue covering entire muscle

fascia

covers outside of epimysium

muscle fasciculi

visible bundles composed of muscle fibers that make up the whole muscle

perimysium

connective tissue that covers muscle fasciculi

muscle fiber

make up the fasciculi; also known as a muscle cell

endomysium

connective tissue layer that covers muscle fibers

sarcoplasm

cytoplasm of the muscle fiber

myofibril

threadlike structure composed of myofilaments that extends the length of the muscle fiber

actin myofilaments

thin myofilament that looks like a string of pearls

troponin

provides calcium attachment sites; part of actin myofilament

tropomyosin

exposes calcium attachment sites; part of actin myofilament

myosin myofilament

thick myofilament; looks like golf clubs

sarcomeres

basic structural and functional unit of skeletal muscle; smallest part that can contract on its own

Z line

beginning and end of a sarcomere

I band

light zone; has actin only; shortens during contraction

A band

dark zone; has both actin and myosin overlapping

H zone

center of sarcomere; space between actin; disappears during contraction; second light zone

M line

middle of sarcomere

sarcolemma

cell membrane of muscle fiber

T tubules

connects sarcoplasmic reticulum

sarcoplasmic reticulum

specialized smooth ER; high calcium concentration

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