Chapter 3, Lesson 3
 The
circulatory system includes
your heart?
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The heart is a special muscle that serves as
the center of the circulatory system.
The circulatory system is the group of organs
and tissues that act as transfer stations
carrying needed materials to cells and
removing waste products.
This system includes the heart, blood vessels,
and blood.
Also called the cardiovascular system.
 Your
heart lies in the center of
your body?
 Your
heart is located in the middle
of your chest between your lungs.
 Your heart is behind your sternum
and slightly angled to the left..
 Your
heart acts as a pump in your
body?
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The heart pumps blood around the body
though a network of blood vessels.
Arteries: Blood vessels that carry blood away
from the heart to various parts of the body.
Veins: Blood vessels that carry blood from all
parts of the body back to the heart.
Capillaries: Tiny blood vessels that carry
blood to and from almost all body cells and
connect arteries and veins.
 You
can live without oxygen for
up to 5 minutes.
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You cannot live more than a few minutes
without oxygen.
Your heart and lungs work together to deliver
oxygen to your body’s cells.
Pulmonary circulation: When blood travels
from the heart, through the lungs, back to
the heart.
Systemic circulation: When oxygen-rich blood
travels to all body tissues except the lungs.

http://www.youtube.com/watch?v=LqhvmUE
dOYY
1. Label the 4 main chambers of the heart.
2. Draw the pulmonary circulation path and the
systemic circulation path.
3. Use page 72 in book if you need too.
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Blood pressure: Is the force of blood
pushing against the walls of the blood
vessels.
You need a certain amount of pressure to
make blood circulate.
1. Systolic pressure: When the heart
contracts and pumps blood into the arteries.
2. Diastolic pressure: When the heart relaxes
to refill with blood.
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What makes up your blood?
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http://www.youtube.com/watch?feature=play
er_embedded&v=AIcAF34MPpU#!
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Plasma: Yellowish, watery part of blood,
makes up over half of its volume.
White blood cells (leukocytes): Fight
infection.
Red blood cells (erythrocytes): Carry oxygen
from the lungs to all body parts.
Platelets: The smallest, help blood clot at
the side of a wound.
= UNIVERSAL DONAR
= UNIVERSAL RECIPIENT
 Activity
3-3: Exploring the circulatory
system (both sides). Use pages 7176.
 Answer the following question in 1
paragraph on a separate sheet of
paper:
How does aerobic activity help the
heart?
http://www.youtube.com/watch?v=mDSFxcf2
UgQ
Song

http://www.youtube.com/watch?v=LqhvmUE
dOYY
Rap
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