RECAP THE CONCEPTS
Respiratory system
The human respiratory system consists of the nose, windpipe and lungs.
We take in oxygen for the body and give out carbon dioxide from the body.
When we inhale (breathe in), the ribcage moves out and up. The diaphragm moves down. As a result, our lungs expand.
When we exhale (breathe out), the ribcage moves in and down. The diaphragm moves up. As a result, our lungs contract.
Circulatory system
The human circulatory system consists of the heart, blood and blood vessels.
It transports oxygen, digested food and water to the cells in the body.
It transports carbon dioxide and other waste materials away from the cells of the body.
Digestive system
Our digestive system breaks down food into simpler substances.
Digested food and water is absorbed into the circulatory system (blood stream) so that they can be used by the body.
Mouth
Teeth chew and break up food into smaller pieces.
Digestive juices in the saliva break down food into simpler substances.
Gullet
It is a muscular tube that pushes food from the mouth to the stomach.
Stomach
It is a muscular organ that mixes the food up with the digestive juices.
Digestive juices break down food into simpler substances.
Small intestine
Digestive juices break down food into simpler substances.
Most digestion occurs in the small intestine. Digestion is completed in this organ.
Digested food is absorbed into the bloodstream of the circulatory system.
Large intestine
No food is digested after it enters the large intestine.
Water (and mineral salts) is absorbed from the undigested food into the bloodstream of the circulatory system.
Rectum and Anus
The undigested food is stored in the rectum before it is passed out as faeces through the anus.
Skeletal and Muscular system
Our skeletal system is made up of bones such as the skull, rib cage and backbone.
It supports the body and gives the body shape.
It protects organs like the brain, lungs and heart.
The skeletal system works together with the muscular system to help us move.
Practice: Mastering Keywords
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