anatomy and phys muscles
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34 terms
Terms | Definitions |
|---|---|
 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 |
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