Muscular SystemMuscular System

Mrs. SmalleyMrs. Smalley

Function of the Muscular Function of the Muscular SystemSystem

The muscular system enables The muscular system enables movement of your body and internal movement of your body and internal organs.organs.

Muscles have many functions, such Muscles have many functions, such as:as:– Keeping your heart beatingKeeping your heart beating– Pulling your mouth into a smilePulling your mouth into a smile– Moving the bones of your skeletonMoving the bones of your skeleton

Types of MuscleTypes of Muscle

1. Involuntary muscle – muscle that is 1. Involuntary muscle – muscle that is not under your conscious control not under your conscious control – Example: breathing and digesting foodExample: breathing and digesting food

2. Voluntary muscle – muscles that are 2. Voluntary muscle – muscles that are under your conscious controlunder your conscious control– Example: smiling, turning a page in your Example: smiling, turning a page in your

bookbook

Three Types of Muscle Three Types of Muscle TissueTissue

There are three types of muscle There are three types of muscle tissue: skeletal, smooth, and cardiactissue: skeletal, smooth, and cardiac

1.1.Skeletal muscleSkeletal muscle – are attached to the – are attached to the bones of your skeleton and provide bones of your skeleton and provide the force that moves your bones the force that moves your bones – They are voluntary muscles that can They are voluntary muscles that can

get tired easily.get tired easily.

Three Types of Muscle Three Types of Muscle TissueTissue

2.2. Smooth muscleSmooth muscle – muscle that – muscle that makes up most of your organs (ex: makes up most of your organs (ex: stomach)stomach)

– After you eat, the muscle of your stomach contracts, moving the food around to help it digest.

– They are involuntary muscles that do not get tired.

Three Types of Muscle Three Types of Muscle TissueTissue

3.3. Cardiac muscleCardiac muscle – found only in the – found only in the heartheart

– They are involuntary and They are involuntary and do notdo not get get tired.tired.

Structure of the Muscular Structure of the Muscular SystemSystem

TendonsTendons – attach – attach the skeletal the skeletal muscles to bone.muscles to bone.

Tendons are strong connective tissue at the end of a muscle that connect to the bone.

Muscles at WorkMuscles at Work

Muscle cells contract Muscle cells contract when they receive when they receive messages from the messages from the nervous system.nervous system.

Muscle cells can only Muscle cells can only contract so skeletal contract so skeletal muscles must work muscles must work in pairs.in pairs.

While one muscle While one muscle contracts, the other contracts, the other muscle in the pair muscle in the pair relaxes to its original relaxes to its original length.length.

For example: In order For example: In order to bend the arm at to bend the arm at the elbow, the bicep the elbow, the bicep contracts and in order contracts and in order to return the arm and to return the arm and bicep to its original bicep to its original shape, the tricep has shape, the tricep has to contract. to contract.

Check out this cool video of the Check out this cool video of the muscular system!muscular system!

http://www.youtube.com/watch?http://www.youtube.com/watch?v=oZ1_TAwCUWw&feature=relatedv=oZ1_TAwCUWw&feature=related

Guess that Guess that system!!system!!

Entrance TicketEntrance Ticket

1. Helps oxygen 1. Helps oxygen move to needed move to needed parts of the body parts of the body

(especially (especially muscles)muscles)

2. The main function of 2. The main function of this system is to exchange this system is to exchange gases (oxygen in, carbon gases (oxygen in, carbon dioxide out)dioxide out)

3. The main function of 3. The main function of this system is for this system is for supportsupport

4. Without this system, 4. Without this system, we would not be able we would not be able to turn our food into to turn our food into energy.energy.

5. Without this system, 5. Without this system, we would not be able we would not be able to turn our food into to turn our food into energy.energy.

6. Two main parts are 6. Two main parts are the brain and the the brain and the spinal cord.spinal cord.

NeuronNeuron

Cardiac MuscleCardiac Muscle

ClavicleClavicle

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