Page 18 - e book prim 6

Delta Modern Language Schools
Science department
Grade 6
1st term 2024- 2025

4. The skeletal muscles are often work in pairs and move in opposite directions as
shown in the previous example.

Types of muscle

Involuntary Voluntary
Theymaruescmleusscles that move muscles
They are muscles that you can
automatically and you cannot
control their movement
control their movement.

Examples of involuntary muscle

❶-Cardiac muscle

-The heart is made of a type of involuntary
muscles known as cardiac muscle.
-Cardiac muscle contracts and relaxes without stopping to allow the
heart pumps the blood carrying oxygen to all the body cells.

❷Eye muscles

-Your eyes contain a type of involuntary muscles that contract when
you close your eyelid to allow you blink many times in one minute
without thinking.
►Your eyes also contain voluntary muscles that surround the eyeball
to help you move your eyes in different directions.

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