The Muscular System Types of Muscles Skeletal Muscle Smooth Muscle Cardiac Muscle **Muscles are connected to bones by tendons
Human Body for Students: Muscular System
The Muscular System Skeletal Muscle Attached to and moves bones Contracts/relaxes to move bone Muscle is striated (banded) Consists of bundles of muscle fibers Voluntary Muscles Move only when you want them to
The Muscular System Smooth Muscle Does not have bands Involuntary Contract without actively causing them to Tires slowly Control breathing, blood pressure, and digestive system
The Muscular System Cardiac Muscle Found only in heart Fibers make complex mesh Involuntary Does not tire
The Muscular System Actions of Skeletal Muscles Work in pairs Flexor-muscle that bends part of the body Extensor-muscle that straightens the body part Nerve tissue “tells” muscles to contract or relax “Strong” contractions occur when many muscle fibers are signaled to do so
Injuries to Muscular System Possible Injuries Strains Muscles or tendons are pulled beyond normal range of motion Tendonitis Tendons are over used & become inflamed Anabolic Steroids Cause high bp; damage heart, liver, and kidneys; can stop bone growth
Injuries to Muscular System Healing Injuries Limit mobility for an extended period of time Apply ice (reduce swelling) then heat (relax and loosen muscles) Apply electric current to stimulate healing process Shorten or replace ligaments/tendons
Injuries to Muscular System Exercise to Reduce Risk Strengthen skeletal muscles by Resistance Exercise (bench press, pull ups) Aerobic Exercise Strengthen heart and increase endurance Jogging, cycling, swimming
How Muscles & Bones Work Together How Your Body Works: Bone and Muscle How We Control Bones and Muscles