Brief research on Muscular System: Why do we need it?

Today, I plan to finish my research so that Joy and myself can start
on the powerpoint presentation.

Question 1: Why do we need it? Describe what the body system does for you, what functions does it perform?

MUSCULAR SYSTEM (Basic Information):

•  The human body contains over 650 individual muscles in which they are attached to the skeleton. (the skeleton provides a pulling power that gives us the ability to move around)
• It's main job is to provide movement for the body (just as the skeletal system)
• It consists of 3 different types of muscle tissues (skeletal, cardiac and smooth)
• Each of these tissues have various abilites to contract, allowing the human body to move and function
• 40% of our weight can make up to be the muscles within our body
• Cardiac Muscles: Found in the heart (in the form of a involuntary muscle) It keeps the heart pumping and it pumps blood through our body. (Involuntary muscles line the internal organs of the body. Also known as the 'smooth' muscles that control things such as our stomach, etc.
• Voluntary Muscles: used when throwing balls, walking, running and lifting various objects, etc. Also known as the 'skeletal' muscles. They are controlled by the signals of our brain, allowing the trigger of the contraction... performing the desired movement.
• Functions:- The muscular system has various roles towards the human body.
  - It is made up of muscles, joints, tendons, bones and ligaments that give continual support to the internal organs
  - These systems work together to provide our body with movement, posture, etc.

Bibliography: http://www.ehow.com/about_5086848_functions-muscular-system.html http://library.thinkquest.org/10348/find/content/muscular.html