Chapter 9 Section 3
04-13-04
Muscular System: is made up of muscles and the
connective tissue that attaches the muscles to the bones
3 Types of Muscles:
1) Smooth: found in the digestive tract
and the walls of blood vessels
2) Cardiac: found only in the heart
3) Skeletal: muscles that surround the
bones and protect inner organs
Types of muscle action:
1) Voluntary: under your control
2) Involuntary: not under your control
There are more
than 600
Muscles in the
body.
Making Connections: Tendons: connect the muscles to
the bones
Working Together:
Flexor: Makes a muscle bend
Extensor: When a muscles straightens part of your
body
Keeping Muscles Fit:
Aerobic Exercise: (ex. Walking, running,
swimming) helps strengthen you heart and give
your muscles endurance.
Resistance Exercise: (weight lifting)
strengthens your skeletal muscles
Dangers of Steroids:
Anabolic Steroids: powerful drugs that
resemble testosterone (male sex hormone).
Effects:
1) Threatens the heart, liver, and kidneys
2) Can cause high blood pressure
3) Can cause the bones to stop growing