The Muscular System

WARM UP:•Get an article from the front stool.•Read the article.•Answer the questions on the back.

•How many muscles are in the human body?• A.) 650,000,000• B.) 6,500• C.) 650• D.) 65• E.) 6.5• F.) Nobody Knows.

Copyright © 2010 Ryan P. Murphy

WHAT IS THE PURPOSE OF THE

MUSCULAR SYSTEM?

Major Functions :

The 3 M’s of the Muscular System:• 1. Movement• Muscles contract and relax to allow movement

• 2. Maintaining Body Temperature• When muscles contract, they release heat

• 3. Maintaining Posture• Muscles make adjustments to you keep you standing

straight

CONTEXT CLUES:Jason made a voluntary decision to go to the Lil Wayne concert. First, he and his friends asked permission from their parents several months in advance. Then, they volunteered to mow their neighbors lawns to earn enough money for tickets. This was a voluntary decision because nobody MADE Jason go to the concert. He decided to go of his own volition.

WHAT DO THESE WORDS HAVE IN COMMON?MAKE A PREDICTION…What do they mean?

VOL ABILITY TO CHOOSE, or WILL in LATIN

VOLUNTARY:SOMETHING YOU CONTROL OR CHOOSE TO DO

What is INVOLUNTARY?

INVOLUNTARY:SOMETHING YOU DO NOT CONTROL; HAPPENS AUTOMATICALLY

HOW DO MUSCLES MOVE?

2 Types of Muscle Movement:

VOLUNTARY MUSCLES:

• Muscles that move when your brain tells them to. • Muscles that you can

control.• Examples:• Arms• Legs

INVOLUNTARY MUSCLES:

• Muscles that you do not have to think about moving- they just move on their own • Muscles that you can

NOT control.• Examples:• Heart• Stomach

WHAT IS MUSCLE MADE UP OF?

3 Types of Muscle Tissues:• 1. Skeletal Muscle• Voluntary muscles that are attached to the

skeleton• 2. Smooth Muscle• Involuntary muscle found in most organs• 3. Cardiac Muscle• Involuntary muscle found only in the heartSkeletal muscle Smooth Muscle Cardiac Muscle

3 Types of Muscle Tissues:

Muscle Type Voluntary ORInvoluntary Reacts Quickly Tires Quickly

Skeletal

Smooth

Cardiac

Reminder:• What is a joint?• Place where bones meet

• What is a tendon?• a strong band of tissue that connects a muscle

to a bone

• What is a ligament?• a strong band of tissue that connects a bone to another bone

Muscles Pairs:• All skeletal muscles work in pairs• One muscle contracts:• They shorten and pull the tendons, the tendons pull the

bones, bone moves• Another muscle relaxes:• Muscles lengthen and do not pull on tendons

Relaxing + Contracting:

Joints in Action:• http://kidshealth.org/teen/your_body/body_basics/bones_m

uscles_joints.html#

• http://kidshealth.org/kid/interactive/muscles_it.html

MUSCLE CHALLENGE:

PUT YOUR MUSCLES TO THE TEST!

Write whether you agree or disagree to the following and WHY:Athletes’ like Lebron James, Kobe Bryant, and Dwayne Wade have

bigger muscles than other people because when they are born, their muscles are naturally stronger and more developed than most people’s muscles.

Muscles grow from being stressed, and then recovering. Burning is a sign that you are damaging your muscles. The soreness is a sign that your muscles are damaged and need to recover. Once they recover, they grow back THICKER than they were before!

FAST FACTS!Muscle Growth and DevelopmentAn infant’s muscles cannot do very much. A baby cannot

lift its head because the neck muscles are not strong enough to support it. For the first few months of life, a baby needs extra support, until the neck muscles grow strong enough to support the baby’s head.

Science Notebook:• Title Page Human Body• Cells, Tissues & Organs Article• Human Body: Levels of Organization• Human Organ Systems• Title Page Skeletal System• How are bones used for support?• Skeletal System Notes• Skeletal System Notes• Musculoskeletal System Station Challenge• Title Page Muscular System• Muscular System Article• Muscular System Notes• Types of Muscles Diagram• Muscle Challenge