Transcript muscular system - Duplin County Schools

The Muscular System
Yeah…just like that!
Muscular System Overview
The muscular system consists of all the muscles in your internal
organs, as well as those attached to bones.
You have over 600
muscles responsible for
moving body parts
FUNCTIONS of the Muscular
System
How do muscles cause movement?
- They pull on bones. They cannot push at all.
1. moves body parts by contracting (getting shorter)
2. controls life functions (breathing, heartbeat, digestion,
etc.)
Muscle Control
Some muscles are controllable by your thinking, other’s aren’t!
Rubbing your stomach .vs. making your heart stop beating.
A voluntary muscle can be controlled by thinking. For example,
the biceps of your upper arm.
Involuntary muscles automatically contract on their own, such as
your stomach.
STRUCTURES—Types of
Muscle
Muscles aren’t all built the same way
They have different jobs
STRONGEST muscles tire quickly
ex: what you would use to push a refrigerator
1. skeletal muscles
Two things about skeletal muscles:
a.) they’re all voluntary
and
b). they are attached to bones & structures
needing movement
Structures-Types of Muscle
Flexor and extensor muscles usually work in pairs:
i. flexor – bends a joint (biceps)
ii. extensor – straightens a joint (triceps)
Smooth muscle- found lining the internal organs.
- They are good at changing the shape and thickness of organs
like your intestines, bladder, and your blood vessels.
2. smooth muscles
a. they’re involuntary, working
automatically
b. found in internal organs
(intestines, blood vessels)
Structures-Types of Muscle
The heart is made of cardiac muscle, which never has to rest to
keep going for as long as you live.
3. cardiac muscle
a. involuntary, thankfully
b. found only in the heart
so, those are the three types
of muscle, what they do, and
where they’re found!