The Muscular System Pgs 46-47

Intro Video

2 Functions of the muscular system

1 st Function of the muscular system

Function of the muscular system Provides movement In conjunction with the skeletal system

2 nd Function of the muscular system

Helps organs carry out life functions

3 Types of Muscles

1 st Type of Muscle.

Skeletal Muscles

Properties of Skeletal Muscles Majority of your muscles

Striated Striped appearance

Connect to bones with tendons

They are voluntary

These muscles help you move.

React quick, but also tire quick

How muscles deal with getting tired The fibers inside alternate being used

Take a pencil Fold a paper clip so it is resting on the pencil Not supporting paper clip in any way and it must remain perpendicular to paper Try to make the paper clip stay still Or hold above paper and try to make stay still

It’s a good thing your heart is not made of Skeletal Muscle How long can you make your hand a heart Open fully and close every second

2 nd Type of Muscle Smooth Muscle

Smooth Muscles: found in the walls of internal organs and the blood vessels.

They are involuntary

They react slowly and and tire more slowly than skeletal muscle.

3 rd Type of Muscle Cardiac Muscles

Cardiac Muscles: Muscles that make up the heart. Striated

They are involuntary

Cardiac Muscles The muscle can contract repeatedly, it will not tire.

What a real heart beating looks like

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Why do your muscles feel “bigger”?

Figure it out based on animation sciences.com/en/a85-biceps-and-triceps

Muscles Work in Pairs Muscles can only contract, they do not extend or get larger. Skeletal muscles work in pairs so when one contracts the other relaxes. Examples: Biceps/Triceps, Hamstring/Quadriceps

String can only pull not push String on both sides of a ruler demonstration

Smart Board Venn Diagram

Bpop

Muscle Practice sheet