The circulatory system functions to transport oxygen, nutrients, hormones, and waste products throughout the body. It consists of the heart, blood vessels including arteries, capillaries and veins, and blood. The heart pumps blood through two circuits - pulmonary circulation to the lungs and systemic circulation to the rest of the body. Deoxygenated blood enters the heart's right side, is pumped to the lungs to receive oxygen, and enters the left side to be pumped through the body, where it releases oxygen and picks up carbon dioxide to be returned to the heart again.

1. The Circulatory System
1. FUNCTION
2. PARTS
3. HOW DOES
BLOOD
CIRCULATE?
4.HABITS FOR A
GOOD
CIRCULATORY
SYSTEM

2. 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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3. 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.

4. 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.

5. 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.

6. 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.

7. 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.

8. http://www.cengage.com/biolog
y/discipline_content/animations/
blood_circulation.html
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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