Skeletal System and Nervous System Notes

BODY SYSTEM

•      The body is made up of millions of cells which we cannot see with a naked eye.

•      Special cells combine together to make an organ.

•      An organ is a complex structure within the body. It performs special function/s.

•      A body system consists of a number of organs which work together.

Figure 1: Organization of a body system

Introduction to body systems:

•      The system which is responsible for transporting nutrients and other substances to different parts of the body is: Circulatory system

SKELETAL SYSTEM

•      Every person has a skeleton made up of bones.

•      These bones give shape to our body, let us move in many ways, and protect our internal organs.

•      The skeletal system is the framework of bones that give support to our body.

What are bones made of?

•      If you've ever seen a real skeleton or fossil in a museum, you might think that all bones are dead.

Figure 10: Dinosaur fossil in a museum

•      Although bones in museums are dry, hard, or crumbly, the bones in our body are different.

NERVOUS SYSTEM

•      The nervous system controls the different organs of our body.

•      The brain is the control centre of entire body.

•      It may also be called the human computer.

•      The brain not only controls what we think and feel, but also how we learn and remember, and the way we move and talk.

Figure 27: Nervous system

•      The brain controls many other things such as the beating of heart, the digestion of food, and yes, even the stress we feel.

Figure 28: Human brain