types of muscle

striated medical education contraction muscles layers biology health medicine schematic heart diagram system anatomical musculoskeletal connective tissue tendons cardiac contractions elasticity reproductive intestines smooth muscle contract expand voluntary cytoplasm skeleton periosteum proteins hollow visceral organs myofibrils bundles vector bones joints structure contractility fiber contractibility fascicles striped excitability perimysium actin sarcoplasm extensibility types glycogen granules digestive tract tissues multinucleated muscular myosin epimysium blood vessels skeletal anatomy intestinal abs masculine biceps cardiology pain human arm physical power flat parallel