Defining the Muscular Sustem

Structure and Function

The functions of the muscular system

-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

Makes up more than 40% of a person’s body weight

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

-Found only in the heart

-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.

                                 Basic Muscle Movement