Muscular quiz

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triad

- 2 cisternae, along with transverse tubule

myofilaments (both thick and thin)

- arranged in a specific pattern - results in a distinct appearence

muscle fibers

- cells, multi-nucleated, can be up to .5 meters long, only .1 mm thick

cardiac

- involuntary, striated, heart

cisternae

- larger tubules of the sacroplasmic reticulum

thin (actin filament)

- made up of 3 proteins (actin, troponin, tropomy)

Thick (myofilament)

- made up of one protien, myosin

sacrolemma

- membrane around muscle fiber

sacroplasm

- the cytoplasm of a muscle fiber

Skelatal

- voluntary, striated, attached to the bones

sacromere

-functional unit of muscle - z line to next z line

M-line

Middle of H-zone (protein molecules lined up in a row that anchor thick filament in place)

What happens in muscle contraction

When muscles are stimulated to work, the contract and get shorter

myofibrils

are made up of individual strands cslled filaments/myofilaments

A-band

area where both thin and thick filaments exist

I-band

area where there are only thin filaments

Epimysium

connective tissue that forms outer surface of muscle

perimysium

connective tissue that seperates one fascle from another

Endomysuim

connective tissue that seperates one muscle fiber from another

aponenrosis

connects msucle to bone (wide, thick, thin) or connects muscle to muscle

tendon

connects muscle to bones

Smooth

involuntary, walls of blood vessels, some digestive organs

muscle fiber

made of group of structures called myofibrils

fasicle

made up of muscle fibers

muscle

made up of structures called fascles

H-zone

middle of A-band with only thick filaments

z-line

middle of I-band (protein strands that attach thin filaments to each other)

transverse tubule

not a part of the sacroplasmic reticulum

myofibrils

parellel cords of protein

do muscles push or pull

pull

sacroplasmic reticulum

surrounds each myofibril, used for storage of calcium, lattice like network of tiny tubules

fascia

thin, wraps around muscles for support


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