1. Muscular System

2. The purpose of the muscles in your body is MOVEMENT.
We are talking about the movement in your legs while you walk, the beating of your heart, the contraction of the small blood vessels in your brain.
The muscles provide the forces that enable the body to move. Muscles stretch across joints to link one bone with another and work in groups to respond to nerve impulses.

3. The muscular systems makes up nearly half of the weight of the human body
This is why when we train we sometimes put on weight instead of losing it…its muscle weight
There are muscles in the human body that are attached to the 206 bones

4. Parts of the Muscular System
muscles which are made up of fibers and cells
Tendons which connect your muscles to your bones at insertion points

5. Types of Muscles Involuntary Voluntary
Muscles that are not under your conscious control
Breathing
Food digestion
Heart beating
Voluntary
Muscles that are under your control
Smiling
Turning a page in a book
Walking

6. Types of muscle tissue

7. Skeletal Muscle Skeletal muscles are attached to the skeleton
They work in pairs: one muscle moves the bone in one direction and the other moves it back again
Skeletal muscles are voluntary muscles - in other words we think about what movements we want to make (at least, usually!) and send messages via our nervous system to tell the appropriate muscle(s) to contract.
Muscle contractions can be short, single contractions or longer ones.

8. Smooth Muscle Found in the walls of internal organs such as intestines
Made of short spindle shaped fibers packed together like layers. Smooth muscle is found in our internal organs: in our digestive system, our blood vessels, our bladder, our respiratory organs and, in a female, the uterus.
Smooth muscle can stretch and maintain tension over extended periods
Smooth muscles are involuntary muscles - in other words we do not have to think about contracting them because they are controlled automatically by the nervous system. It would be pretty inconvenient if we had to think about digesting our food, for example!

9. Cardiac Muscle
As the name should tell you, cardiac muscle is found only in the heart.
It can stretch, just like smooth muscle, and contract like skeletal muscle.
It is a twitch muscle - it only does short single contractions
Like smooth muscle, cardiac muscle is involuntary. It'd be rather dangerous if it were voluntary - we could stop our heart beating any time we wanted!

10. Strength and Flexibility
Exercise maintains strength and flexibility
When you exercise it cause the muscle cells grow in size and cause the muscle to become thicker
The thicker the muscle the stronger the muscle
When you stretch or warm up before exercise it cause the muscle to become flexible and prepares them for the activity

11. Fun Facts about the Muscular System
Eye muscles are one of the busiest muscles in your body: scientists believe they move more than 100,000 times a day.
Your muscle cells produce enough heat every day to boil almost 2 pints of water for an hour.
You use your muscles to stand still. Try it. Stand as still as you can. Gravity will make you sway, but your muscles will pull you straight.
Smile! You've just used about 30 muscles. Muscles control your eyelids, nostrils and brow. They work together to show the slightest change in your emotions.
It takes 17 muscles to smile and 42 to frown.

12. There are muscles in the roots of your hair that give you goose bumps
When you shiver, your muscles contract involuntarily. This releases energy that keeps your body warm.
Believe it or not our one and only cardiac muscle never gets tired. Your tireless heart beats more than 4500 times each hour.
Strongest muscle in you body is in the jaw
Smallest muscle is in your ear
Largest muscle is the Gluteus Maximus…your bottom