Circulatory System
Consists of the following main
organs:
1. Heart
2. Lungs
3. Blood Vessels
3. Transports white blood cells
to defend the body against
disease (immune system).
Transport system reaching
every cell in the body.
1. Blood delivers nutrients
absorbed by the digestive
system and oxygen absorbed
by the respiratory system.
2. Transports waste products
from cells for removal by the
excretory and respiratory
systems.
Heart
Muscle that contracts and
relaxes to pump blood around
the body. Each side of the
heart is a separate pump.
The right side pumps blood to
your lungs, where it receives
oxygen and gives off carbon
dioxide.
The left side of the heart
receives blood from the lungs
and pumps the blood around
the body.
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Each side of the heart is
divided into 2 chambers:
http://heart.healthcentersonline.c
om/heartvalve/valvulardiseaseov
erview.cfm
Top two chambers are called
Atria and the bottom two
chambers are called Ventricles.
Draw and label Figure 3.17 on
page 137.
3 Types of Blood Vessels
1. Arteries – Transport
oxygenated blood away from
the heart, to the rest of the
body.
Veins – Transports
deoxygenated blood (high in
carbon dioxide) from the
cells to the heart. Veins have
valves that stop the blood
from flowing backwards.
2
Vericose Veins
Capillaries – very small, thin
blood vessels. This is where
the blood gasses and
nutrients are exchanged with
cells.
1. Capillaries are made up of
specialized epithelial tissue
that is only one cell layer
thick.
2. Capillaries are very narrow,
so that the blood cells must
go through in single file.
Skin Capillaries
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Blood
Consists of:
1) 1. Red blood cells (
hemoglobin) – carries oxygen to
the cells.
1) 2. White blood cells ( immune
system)
3. Platelets – help to stop
bleeding (clotting)
4. Plasma – liquid portion
(55% of blood volume),
transports nutrients and
carries waste, such as carbon
dioxide away.
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