#physiolgoy

[er-cryptid]

Muscular System

-- there are over 600 muscles that make up the muscular system

-- muscles are made of bundles of muscle fibers

-- the muscle fibers are held together by connective tissue

-- when stimulated by nerve cells, muscles contract

-- when muscles contract, they become short and thick

-- contraction causes movement

[er-cryptid]

Skeleton

Axial Skeleton -- main trunk of the body -- includes      -- skull      -- spinal column      -- ribs      -- sternum

Appendicular Skeleton -- extremities -- includes      -- shoulder girdle      -- arm bones      -- pelvic girdle      -- leg bones