Muscular System

Functions of the muscular system Voluntary movement Involuntary movement Protection of internal organs

Three types of muscle tissue Skeletal muscle tissue is attached to bones and causes movements of the body. Also called striated muscle or voluntary muscle

Three types of muscle tissue Cardiac muscle is responsible for the rhythmic contractions of the heart. Cardiac muscle is involuntary = it generates its own stimuli to initiate muscle contraction.

Three types of muscle tissue Smooth muscle lines the walls of hollow organs. (ie: blood vessels and the digestive tract) Smooth muscle contraction is relatively slow and involuntary

Structure of the Skeletal Muscle Fascia Covering of muscle Become tendons (only in skeletal muscle)

Structure of the Skeletal Muscle Myofibrils Muscle fibers Contraction In all muscle types

Structure of the muscle Two key filaments that make up myofibrils 1. Actin is a thin filament involved in contraction. 2. Myosin is a thick filament involved in contraction

Connective tissue covering of skeletal muscle

Muscle Fatigue

Oxygen Debt Oxygen debt is defined as the extra amount of oxygen that must be taken in by the body for cellular processes, and it represents the difference between the amount of oxygen needed for totally aerobic muscle activity and the amount actually used.

Muscular system vocabulary PeristalsisMyopathy RICE (acronym) Muscle tone Isotonic contractions Isometric contractions ATP Anaerobic glycolysis (anaerobic respiration) Aerobic respiration Rigor mortis Origin (attachment) Insertion (attachment)

Diseases/conditions Myasthenia gravis Disuse atrophy Duchenne Muscular dystrophy (DMD) Hernia Myofascial pain syndrome SpasmCrampStraintetanus