The Circulatory System

1. FUNCTION

2. PARTS

3. HOW DOES BLOOD CIRCULATE?

4.HABITS FOR A GOOD CIRCULATORY SYSTEM

1. FUNCTION:The circulatory system plays an important role in the nutrition process.

Heart pumps blood to all the body cells through the circulatory system

The circulatory system takes oxygen and nutrients to all the tissues of the body.

It also picks up waste products like carbon dioxide. Then it takes them to the organs that eliminate them.

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2. PARTS OF THE CIRCULATORY SYSTEM:

2.1 THE HEART 2.2 BLOOD VESSELS

2.3 BLOOD

The heart is a hollow, muscular organ, about the size of your fist. The function of the heart is simple. It keeps blood circulating throughout the body.

A more than 100,000 Km long system through which blood is distributed to the body.

Fluid that delivers oxygen, hormones, and nutrients to the cells and carries away the wastes that the cells produce.

2.1.2 PARTS OF THE HEART: 2.1.3 HOW DOES HEART WORK?

The heart contains four open spaces called chambers. The two upper chambers are the right atrium and the left atrium. The two lower chambers are the right ventricle and the left ventricle.

When blood goes into the heart, it enters in the right atrium or in the left atrium.Then it goes to the ventricles.

The septum divides into two sides:right and left.

When the ventricles contract, they push the blood out of the heart.

2.2 BLOOD VESSELS

ARTERIES: Largest blood vessels,which carry blood away from the heart.

CAPILLARIES: Smallest blood vessels, which link arteries and veins.

VEINS: Blood vessels that carry blood back to the heart.

2.3 BLOOD. TYPES OF BLOOD CELLS

RED BLOOD CELLS: Carry oxygen. They can also carry some carbon dioxide.

WHITE BLOOD CELLS: Fight infections in the body.

PLATELETS: Help to form a solid clot when there is a cut in a blood vessel.

3. HOW DOES BLOOD CIRCULATE?• The heart and the blood vessels form a closed system. Blood is always circulating through

this system.• Blood flows in two different circuits:

- PULMONARY CIRCULATION: Blood flows from the heart to the lungs. In the lungs, the blood releases carbon dioxide and picks up oxygen. Then the blood flows back to the heart. This oxygenated blood is a bright red colour.

- GENERAL OR SYSTEMIC CIRCULATION: Oxygenated blood flows from the heart to the rest of the body. The oxygen goes into the tissues of the body and the blood picks up carbon dioxide. Then the blood flows back to the heart. This deoxygenated blood is a dark red colour.

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1. Deoxygenated blood enters the right atrium and passes into the right ventricle. The right ventricle pumps the blood out of the heart through the pulmonary arteries to the lungs.

2.The blood picks up oxygen and releases carbon dioxide.The oxygenated blood returns to the heart through the pulmonary veins.

3. The blood goes into the left atrium and then into the left ventricle. The left ventricle pumps the blood through the aorta to the rest of the organs in the body.

4.In the organs, the blood picks up carbon dioxide and releases oxygen.The superior vena cava and the inferior vena cava carry deoxygenated blood to the heart.

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