The Muscular System

5/20/2013pgs. 155-156

KnowWhat types of muscles are there? (There are three of them.)

Evidence: you create

The Muscular System

“I don’t know any.” is not an acceptable answer.Use complete sentences.

Clarifying ?s InformationMuscle action

-muscles that we cannot consciously controlThey move on their own.

- muscles that we can consciously control

1. Voluntary 2. Involuntary

- muscles attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (AKA striated or banded muscles)

- Control movements inside your body – involuntary muscles – react slowly (non-striated)

Example: digestive muscles, breathing diaphragm

Muscle types

Example: heartbeat, food digestion, breathing

Example: smiling, chewing, walking, running

The Muscular System

Example: quadraceps, deltoid

involuntary muscles

voluntary muscles

1. skeletal muscles

2. smooth muscles

Clarifying ?s InformationThe Muscular System

Example: Achilles’ tendon- Strong connective tissue that attaches muscles to bone

Muscles work in pairs. One is the flexor; the other is the extensor. Ex. Bicep/tricep

How skeletal muscles work

- forms walls of your heart – doesn’t tire out

Ex: the heart3. cardiac

tendons

Clarifying ?s Information

Summary:

The Muscular System

Example: Biceps/triceps

Step 1: brain sends message along the nerve fibers telling the muscle to contract.Step 2: muscle contracts. Step 3: muscle relaxes.Step 4: opposing muscle receives msg to contract & pulls relaxed muscle back to normal size.

Muscle care Exercise – makes muscles grow wider and thicker – makes you strongerStretching – makes muscles more flexible

Clarifying ?s InformationThe Muscular System

Muscle action-muscles that we cannot consciously controlThey move on their own.

- muscles that we can consciously control

1. Voluntary 2. Involuntary

- muscles that are attached to your bones – provide forces to move your joints – voluntary muscles – fast reacting (also called striated or banded muscles)

- Control movements inside your body – involuntary muscles – react slowly (non-striated)

Example: digestive muscles, breathing diaphragm

Muscle types

Example: heartbeat, food digestion, breathing

Example: smiling, chewing, walking, running

Example: quadraceps, deltoid, abdominus rectus

involuntary muscles

voluntary muscles

1. skeletal muscles

2. smooth muscles

Example: Achilles’ tendon- Strong connective tissue that attaches muscles to bone

- The muscle that forms the walls of your heart – does not tire out like skeletal muscles ((striated)

Example: the heart

2. cardiac muscle

tendons

Clarifying ?s Information

Summary:

The Muscular System

Muscles work in pairs. One is the flexor; the other is the extensor.One of the pair must be in relaxation state when the other contracts or you get a Charlie horse or cramp.

How skeletal muscles work

Muscles can only cause movement by contracting or getting shorter and fatter.

Example: Biceps in upper arm bends elbow joint; triceps on back of arm straightens elbow joint.

Step 1: A message is sent from the brain along the nerve fibers instructing the muscle to contract.Step 2: The muscle contracts. Step 3: The muscle relaxes.Step 4: The opposing muscle recieves the command to contract & pulls the relaxed muscle back to normal size.

Muscle care Exercise – makes muscles grow wider and thicker – makes you strongerStretching – makes muscles more flexible

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