The function of nutrition gives our cells all the energy they

Need to perform their life processes.Four body systems carry

Out the function of nutrition:

DIGESTIVE SYSTEM

RESPYRATORY SYSTEM

CIRCULATORY SYSTEM

EXCRETORY SYSTEM

Digestion is the process in which food changes intonutrients.

It takes place in the digestive system,which has twoparts:

THE DISGESTIVE TRACT

GLANDS

Respiratory is the process where we takes the oxygen and

Releases carbon dioxide. Two processes take place:

LUNG VENTILATION.Inhaling is when air goes into thelung.Exhaling sends air out of the lungs.

EXCHANGE OF GASES The oxygen breathed in goes to the

Blood and the carbon dioxide from the blood moves to thelungs.

The RESPIRATORY SYSTEM it consists of :

RESPIRATORY TRACT

LUNGS

Excretion is the elimination of the waste substances collectedin the blood that cells produced.

EXCRETORY SYSTEM is made up of:

SWEAT GLANDS: They are in the skin and produce sweat.

URINARY SYSTEM: It is made up of:

KIDNEY

URINARY TRACT

Circulation is the transportation of blood through thecyrculatory system,carryng nutrients and oxygen to all thecells and collecting waste substances to release them outsidethe body.

The circulatory system is made up of:

HEART: it is a hollow muscle,that pumps the blood.

BLOOD: it collects oxygen and nutrients.

BLOOD VESSELS: there are three types:

- ARTERIES,

- VEINS

- CAPILLARIES

Blood is a red liquid tissue made up of cells that float in a nutritious liquid called plasma:

BLOOD CELLS There are different types of cells:

RED BLOOD CELLS, WHITE BLOOD CELLS AND PLATELETS

BLOOD PLASMA

The heart has two atria and two ventricles. The veins meet at

The atria.The arteries leave from the ventricles.The heart

pumps blood using systole and diastole movements.

Human circulation is double because it has a pulmonary or

Minor circulation and a general or major circulation.