Defining the Muscular Sustem
Structure and Function
-Aid in movement
-Provide and maintain posture
-Protect internal organs
-Provide movement of blood, food, and waste products through the body
-Open and close body openings
-Produce heat
Skeletal Muscle Overview
Looks striated, or banded, under the microscope
Skeletal muscles have three parts
-Origin is one end of the muscle, attached to the less movable part of the bone
-Insertion is the other end of the muscle, attached to the more movable part of the bone
-The action, or body, is the thick middle part of the muscle
Visceral Muscle
-Lines various hollow organs
-Makes up the walls of blood vessels
-Found in the tubes of the digestive system
-Smooth and has no striations
-Controlled by the autonomic nervous system
Cardiac Muscle
-Striated muscle
-Under involuntary control
-Has specialized cells that provide a stimulus for contraction
Interesting Facts about the Muscular System
-There are muscles in the root of your hair that gives you goose bumps.
-It takes 17 muscles to smile and 42 muscles to frown.
-The hardest working muscle is in the eye.
-The largest muscle in your body is the Gluteus Maximus
-The longest muscle in the body is the Sartorious Muscle in your leg.