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Unit 19: Biology Part 2 Page 45 of 137
milk, and shellfish. If you suspect Maintaining a healthy digestive
that you have a food allergy, a system means maintaining a
medical doctor could be able to healthy diet, and taking care of any
check. illnesses, allergies, or intolerances
which arise.
Lesson 3:
Cardiovascular
System
Every living thing, from tiny
Figure 17 Child suffering from bacteria, to giant oak trees, to you
peanut allergy.
and me, is made of tiny things
Some peoples’ bodies cannot break called cells.
down certain chemicals. These are
called intolerances. A common When groups of cells work
together, they form structures
intolerance is lactose intolerance—
an inability to break down lactose called tissues. When groups of
found in dairy products. Seventy tissues work together, they form
five percent of the world is lactose structures called organs.
intolerant. Your brain, lungs, and heart, are
all examples of organs. When
groups of organs work together,
Summary
they make organ systems, which
are sometimes just called systems.
Digestion is the process of food Your body has many systems,
(and drink) being broken down and
absorbed. The mouth begins the including the cardiovascular
digestion by breaking down food system. In this section, you will
mechanically and beginning learn more about the
cardiovascular system and the
chemical digestions. Protein is important things it does to keep
digested in the stomach. The small
intestine finishes the chemical you alive.
digestion and absorption of food.
The large intestine absorbs excess
water from the waste and finally
passes it through the anus.
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