pratical 3- vocab/muscle types

Smooth muscle

Involuntary muscle found primarily in walls of hollow internal organs, intestines, stomach, airways

Cardiac muscle

Involuntary muscle found only in the heart, steady, rhymed contractions

Skeletal muscle

Voluntary muscle attached to bones, strong, rapid contraction

Fascicle

Bundle of muscle fibers

Tendon

Fibrous connective tissue that attaches muscle to bone

Origin

Muscle attachment to the movable bone, moves toward the origin when muscle is contracted

Insertion

Muscle attachments to the movable bone, moves toward the origin when muscle is contracted

Action potential

Electrical current generated by the change in charge across the muscle cell membrane, leads to contraction of the muscle cell

Cross bridges

Attachments formed between myosin heads and binding sites on actin

Sliding filament theory

States that sarcomere shortens when thin and thick myofilaments slide past each other

Sarcomere

Functional unit of muscle fiber, shortens during muscle contraction

Skeletal muscle structure

Voluntary, Long, multinucleated, striations

Cardiac muscle structure

InVoluntary, short, 1 or 2 nucleus , striations, intercalated discs between cells

Smooth muscle structure

No striations, 1 nucleus, involuntary

Myofilaments

Contractile proteins within myofibrils

1. Thick filaments

2. Thin filaments

Myofibrils

Bundles of myofilaments enclosed in sarcoplasmic reticulum

Sarcomeres

Myofilaments arranged in repeating units

Dorsiflexion

pull toes up

Omo

Shoulder

cleido

Sternum