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Unit 19: Biology Part 2 Page 23 of 137

Objectives

Lesson 3: Cardiovascular System

Every living thing, from tiny  Learn how the flow of blood

bacteria, to giant oak trees, to you throughout the body helps us
and me, is made of tiny things live
called cells. When groups of cells  Learn the process of
work together, they form circulation
structures called tissues.  Learn about common
diseases of the
When groups of tissues work cardiovascular systems and
together, they form structures how to minimize the risk of
called organs. Your brain, lungs, getting these diseases
and heart, are all examples of
organs.

When groups of organs work
together, they make organ
systems, which are sometimes just
called systems. Your body has

many systems, including the
cardiovascular system.

In this lesson, you will learn more

about the cardiovascular system,
and the important things it does to
keep you alive. Here are the
highlights for this lesson:

 Learn about blood, blood
vessels, and the heart

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