Transcript What is a muscle

AIM:
How Do
Muscles
Work and
Why Are
They
Important
to the Body?
What is a muscle?
- tissue made of long thin
fibers that cause movement
of bones, food, blood by
contracting or shortening.
What are INVOLUNTARY muscles?
- muscles you can’t consciously
control. There are 2 types:
a) SMOOTH Muscle
- cause movement of organs &
blood vessels.
Ex: digestive organs push food,
arteries push blood.
b) CARDIAC Muscle
- involuntary muscles found only in
the heart. Heart pumps blood.
What are VOLUNTARY muscles?
- muscles you can consciously control.
Ex: Skeletal muscles.
- also called STRIATED muscle
because they are “striped”.
- they move bones.
How do muscles know when to
contract & when to relax?
- the brain sends signals through
nerves to muscles telling them when
to contract &
when to stop
contracting.
How do muscles work to move
bones?
- skeletal muscles only PULL bones &
they work in pairs.
- one muscle will bend joints while its
partner will straighten the same
joint.
Flexors
• Muscle that bends a
joint.
Ex: Biceps.
Extensors
• Straighten
joints.
Ex: Triceps.
What is a muscle cramp?
-Involuntary contraction of
a muscle. Usually caused by
a lack of 02
What is a muscle sprain?
- An over-extension, tear of
muscle tissue or connective
tissue
Is this a healthy physique?
 Too much weight on
any person’s body can
add more stress on
your joints
 Using too much
protein builds more
fat and doesn’t help
to create even more
muscle.
BrainPop
Muscles: under Health