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34 terms

anatomy and phys muscles

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Extensor digitorum
extends the fingers
biceps brachii
allows you to flex the elbow
trapezius
shrugs your shoulders
buccinator
allows you to blow up a balloon
orbicularis oris
kissing muscle
masseter
used in chewing your food
orbicularis oculi
used to wink
biceps femoris
used to flex your knee
gluteus maximus
extends the hip
frontalis
wrinkles your forehead
zygomaticus
used in smiling
gastrocnemius
toe dancers muscle
triceps brachii
extends the elbow
quadriceps
extend the knee
gluteus medius
injection site
contain intercalated disks, striated, voluntary
cardiac muscles
nonstriated, involuntary
smooth muscles
striated, voluntary
skeletal muscles
perimysium
divides the skeletal muscles into compartments, each containing a bundle of muscle fibers
endomysium
surrounds each skeletal muscle fiber and ties adjacent muscle fibers together
epimysium
surrounds the entire muscle
muscle fibers controlled by a single motor neuron
motor unit
muscle doesn't change length, and tension produced doesn't exceed resistance
isometric
tension rises and the skeletal muscle's length changes
isotonic
twitch
a single stimulus-contraction-relaxation sequence in a muscle fiber
tetany
repeated prolonged contraction of muscles, especially of the face and limbs, caused by low blood calcium
muscle tone
is the continuous and passive partial contraction of the muscles
sarcomere
the smallest functional unit of the muscle fiber. Organizes myofilaments
sarcoplasmic reticulum
a specialized form of smooth endoplasmic recticulum. Forms a tubular network around each myofibril
myofibril
bundles of thick and thin myofilaments, protein filaments consisting primary of the proteins actin and myosin. inside muscle fiber
sacrolemma
cell membrane
sarcoplasm
cytoplasm
carries electrical impulses to the cells interior
tranverse tubules function
acetylcholine
a neurotransmitter, a chemical released by a neuron to communicate with other cells