Download Smooth Muscle

Muscular System
600 Muscles
Types of Muscle Movement
Involuntary- Automatically move without
you knowing.
Voluntary- Brain sends message to muscle.
You control the movements.
Types of Muscles
Smooth Muscles- Which include the
muscles of internal organs and blood
vessels. These muscles move
involuntary.
Cardiac Muscle- Found only in the heart
and also involuntary.
Skeletal Muscles- Are voluntary and help
you move.
Smooth Muscle
Digestive organs
Makes up 7-8% of your
muscles
Involuntary
Cardiac Muscles
Only found in the heart.
Involuntary.
Makes up 3% of your muscles.
By age 70 heart contracts 2.5 billion
times (assume resting heart beat).
Skeletal Muscles
Makes up 90% of your muscles.
Voluntary- These are the muscles that you
can move.
Types of Injuries
Strain- Muscle “pull” or “strain”
– Tearing a muscle fiber(s), followed by
bleeding or swelling of muscle
– Muscle Cramp- Prolonged contraction of
muscle
Muscles and Movement
Muscles can only contract & relax.
Muscle fibers line up and pull the tendon attached to the bone
to cause movement.
Muscle Pairs
Muscle fibers line up and
pull the tendon attached
to the bone to cause
movement.
Your muscles work in
teams to move your
body. As one group of
muscles is contracting
another group is relaxing
An example of this is
your Bicep and Tricep.
http://www.sirinet.net/~jgjohnso/muscle.html
Systems Working Together
1. Our brain sends a message
2. The message travels down your spinal
cord
3. The motor neuron fires a message
4. The muscle contracts.
5. The muscle shortens pulling on the
tendon
6. The bone connected to the tendon
moves