Science-9 main human organs

The digestive system:
Digestion breaks down food into simpler substances so that it can be absorbed and used by the body. It's mainly in the stomach and small intestine. Food that's digested is absorbed into the blood.

The respiratory system:
This is for taking in oxygen and removing waste carbon dioxide. Air enters the lungs by movement of the rib muscles and diaphragm. Oxygen is absorbed into the blood.

The excretory system:
This removes nasty waste materials, some are even poisonous. Waste material is is filtered out of the blood by the kidneys, the waste then is made into urine.

The circulatory system:
The heart pumps blood around the body. It supplies cells with oxygen and food, then carries away the waste like carbon dioxide.

The reproductive system:
The egg cell comes from the ovaries and is from a female. A sperm cell is made from testes and is from a male. The sperm cell tries to fertilise with the egg cell.

The nervous system:
There are five sense organs:
-Sight (Eyes)
-Sound (Ears)
-Smell (Nose)
-Taste (Tongue)
-Touch/feel (hands/body)
They all contain nerves that send messages to the brain about what's happening. The brain produces a response which it sends via nerves to the muscles.

The endocrine system:
This system produces hormones. Several glands produce these hormones. The hormones control things like growth or sexual(boy/girl) characteristics. They also controls bodily functions like menstruations.

The skeletal system:
There are 206 bones in our body. Their main job is to support the body. There are muscles on the bones that contract and relax, allowing movement. Bones are also around delicate organs to protect them.

The muscle system:
Muscles are attached to the bones. The muscles contract and relax in order to allow movement. Muscles are found in pairs around joints.