Download Evidence: you create The Muscular System

The Muscular
System
5/20/2013
pgs. 155-156
Know
The Muscular System
What types of muscles are there?
(There are three of them.)
“I don’t know any.” is not an acceptable answer.
Use complete sentences.
Evidence: you create
Clarifying ?s
Muscle action
The Muscular System
Information
1. Voluntary
2. Involuntary
involuntary
muscles
-muscles that we cannot consciously control
They move on their own.
voluntary
muscles
- muscles that we can consciously control
Example: heartbeat, food digestion, breathing
Example: smiling, chewing, walking, running
Muscle types
1. skeletal
muscles
- muscles attached to your bones – provide forces to move your
joints – voluntary muscles – fast reacting (AKA striated or banded
muscles)
Example: quadraceps, deltoid
2. smooth
muscles
- Control movements inside your body – involuntary muscles
– react slowly (non-striated)
Example: digestive muscles, breathing diaphragm
Clarifying ?s
3. cardiac
The Muscular System
Information
- forms walls of your heart – doesn’t tire out
Ex: the heart
tendons
How skeletal
muscles work
- Strong connective tissue that attaches muscles to bone
Example: Achilles’ tendon
Muscles work in pairs.
One is the flexor; the other is the extensor. Ex.
Bicep/tricep
Clarifying ?s
The Muscular System
Information
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.
Example: Biceps/triceps
Muscle care
Summary:
Exercise – makes muscles grow wider and thicker –
makes you stronger
Stretching – makes muscles more flexible
Clarifying ?s
Muscle action
The Muscular System
Information
1. Voluntary
2. Involuntary
involuntary
muscles
-muscles that we cannot consciously control
They move on their own.
voluntary
muscles
- muscles that we can consciously control
Example: heartbeat, food digestion, breathing
Example: smiling, chewing, walking, running
Muscle types
1. skeletal
muscles
- muscles that are attached to your bones – provide forces to move
your joints – voluntary muscles – fast reacting (also called striated
or banded muscles)
Example: quadraceps, deltoid, abdominus rectus
2. cardiac
muscle
- Control movements inside your body – involuntary muscles
– react slowly (non-striated)
Example: digestive muscles, breathing diaphragm
- The muscle that forms the walls of your heart – does not tire
out like skeletal muscles ((striated)
tendons
- Strong connective tissue that attaches muscles to bone
2. smooth
muscles
Example: the heart
Example: Achilles’ tendon
Clarifying ?s
How skeletal
muscles work
The Muscular System
Information
Muscles can only cause movement by contracting or
getting shorter and fatter.
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.
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.
Example: Biceps in upper arm bends elbow joint;
triceps on back of arm straightens elbow joint.
Muscle care
Summary:
Exercise – makes muscles grow wider and thicker –
makes you stronger
Stretching – makes muscles more flexible
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