The Muscular The Muscular SystemSystemBy: Jonah Stephens, Matt Stevens,By: Jonah Stephens, Matt Stevens,

& Brent Sweigert& Brent Sweigert

FunctionsFunctions

The muscular system is very important to The muscular system is very important to our body. Without it we wouldn’t be able our body. Without it we wouldn’t be able to move. to move.

As we have already said, muscles help us As we have already said, muscles help us move, they also generate heat, and they move, they also generate heat, and they help us maintain our balance.help us maintain our balance.

Abduction and adductionAbduction and adductionPulls a part of the body away from the body. Like moving your leg away Pulls a part of the body away from the body. Like moving your leg away

from your foot. Adduction is when you pull your arm or leg back from your foot. Adduction is when you pull your arm or leg back towards your body. towards your body.

Depression and elevationDepression and elevationDepression is when you do a downward movement. Elevation is an Depression is when you do a downward movement. Elevation is an

upward movement.upward movement.

Flexion and extensionFlexion and extensionFlexion means that you move a joint to make a bone come closer . Flexion means that you move a joint to make a bone come closer .

Extension is when you move boners further apart using a joint.Extension is when you move boners further apart using a joint.

Types of Muscle Movements

How Muscles WorkHow Muscles Work

Muscles have small fibers that run Muscles have small fibers that run horizontally. When the muscle is relaxed, horizontally. When the muscle is relaxed, the filaments only overlap little bit. When the filaments only overlap little bit. When the muscle contracts/shortens, the fibers the muscle contracts/shortens, the fibers come together in bands or stripes. They come together in bands or stripes. They get shorter by doing this. get shorter by doing this.

The Three Major MusclesThe Three Major Muscles

The three major muscles are smooth, The three major muscles are smooth, cardiac, and skeletal muscles. They all cardiac, and skeletal muscles. They all support different things and have support different things and have different characteristicsdifferent characteristics

Smooth MusclesSmooth Muscles

The smooth muscle is found in the The smooth muscle is found in the digestive tract and blood vessels. These digestive tract and blood vessels. These are muscles that help you smoothly get are muscles that help you smoothly get your poop out of your butt.your poop out of your butt.

Cardiac MusclesCardiac Muscles

They are only found in your heart. They They are only found in your heart. They help your heart beat constantly and help your heart beat constantly and without it, you couldn’t live. without it, you couldn’t live.

Skeletal MusclesSkeletal Muscles

Surprisingly, they are only about half the Surprisingly, they are only about half the weight of a human. They are connected weight of a human. They are connected to our bones for movement and help to our bones for movement and help protect the inner organs of our body.protect the inner organs of our body.

Tendons Tendons

Tendons are the end of each muscle. They Tendons are the end of each muscle. They are connected to the bone and when are connected to the bone and when your muscle contracts, they go along with your muscle contracts, they go along with the muscle and pull the bone making it the muscle and pull the bone making it move. move.

FlexorFlexor

This is a muscle that reduces the angle of This is a muscle that reduces the angle of a joint so that the bones move freely. a joint so that the bones move freely. Without it, we wouldn’t be able to walk Without it, we wouldn’t be able to walk normal. In fact, we wouldn’t be able to do normal. In fact, we wouldn’t be able to do anything normal at all.anything normal at all.

ExtensorExtensor

This is a muscle that helps straighten a This is a muscle that helps straighten a part of the body.part of the body.

DiseasesDiseases

The muscles are great tools for life but like The muscles are great tools for life but like everything, they are not invincible. There everything, they are not invincible. There can be aches, cramps, feeling of can be aches, cramps, feeling of weakness or fatigue. Some common weakness or fatigue. Some common diseases are Muscular Dystrophy, diseases are Muscular Dystrophy, Dermatomyositis, and Rhabdomyolysis Dermatomyositis, and Rhabdomyolysis

Relationships Relationships Works with skeletal system to provide skeletal Works with skeletal system to provide skeletal

movement.movement. Works with the digestive system to control Works with the digestive system to control

entrances and exits of digestive tractsentrances and exits of digestive tracts Works with the endocrine system to produce Works with the endocrine system to produce

heatheat Works with the nervous system to sense thingsWorks with the nervous system to sense things Works with the respiratory system to allow the Works with the respiratory system to allow the

diaphragm to expanddiaphragm to expand Works with the cardiovascular system to provide Works with the cardiovascular system to provide

circulation. circulation.

BibliographyBibliography

Muscles, How We Move and Exorcise. Muscles, How We Move and Exorcise. (Book)(Book)

http://www.ehow.com/facts_5505503_mushttp://www.ehow.com/facts_5505503_muscular-system-do.htmlcular-system-do.html (01/07/10) (01/07/10)

http://www.ehow.com/http://www.ehow.com/about_5086848_functions-muscular-about_5086848_functions-muscular-system.html (01/07/10)system.html (01/07/10)

http://www.wisegeek.com/what-are-http://www.wisegeek.com/what-are-tendons.htm (01/07/10)tendons.htm (01/07/10)