The Muscular System

Yeah…just like that!

Muscular System Overview

The muscular system consists of all the muscles in your internalorgans, 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 asyour stomach.

STRUCTURES—Types of Muscle

Muscles aren’t all built the same wayThey have different jobs

STRONGEST muscles tire quicklyex: what you would use to push a refrigerator

1. skeletal muscles

Two things about skeletal muscles: a.) they’re all voluntary andb). 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.

a. they’re involuntary, working automatically

b. found in internal organs (intestines, blood vessels)

2. smooth muscles

Structures-Types of Muscle

The heart is made of cardiac muscle, which never has to rest tokeep going for as long as you live.

3. cardiac muscle

a. involuntary, thankfullyb. found only in the heart

so, those are the three typesof muscle, what they do, andwhere they’re found!