Muscular System

Movement, posture, body heat, other body systems

striated, voluntary

involuntary, digestive system

heart, striated, involuntary

Fibers

Bundles of fibers

Contain the fascicles

Muscle tissue that surrounds the outermost layer of the muscle

Muscle tissue that separates and surrounds fascicles

muscle tissue that surrounds each individual muscle fiber

muscle fiber membrane

inner material surrounding fibers

Transport

Individual parallel muscle fibers within sarcoplasm

Actin and Myosin

Thin filaments

Thick filaments

Dark and thick (myosin)

Light and thin (actin)

Signals between a muscles and nerves where the muscle and nerves meet

Folded area where muscle and neurons communicate

Gap between the neuron and motor end plate

Where neurotransmitters are stored

The neurotransmitter that crosses the gap and is stored in the vesicles (broken down by Cholinesterase)

The contraction of a muscle occurs as the thin filaments slide past the thick filaments

Increases regeneration of ATP

Muscle loses the ability to contract after prolonged use

A sustained, involuntary contraction

Not enough oxygen causes lactic acid to accumulate in the muscle

Muscles become small and weak due to disuse

Muscles Enlarge

joints stiffen

Cholinesterase can’t break down acetylcholine, muscles contract uncontrollably

Delayed relaxation of the muscle

Autoimmune disease, acetylcholine receptors are damaged

Neurogenetive disease, motor nerves degenerate

Weakening of the muscles

Muscle contractions have lowered activation potential

Neuromuscular blocking agent, competes with acetylcholine