Essential Questions•What are the major

systems of the human body?

•How does the Respiratory System help my body function?

•What are the major parts of the Respiratory System?

What does the Respiratory System

Do? You need oxygen to stay

alive. Oxygen gives your body energy.

The Respiratory System is a group of organs and tissues that exchange oxygen and carbon dioxide between your body and the environment.

When you breathe in, your body gets oxygen. When you breathe out, you breathe out carbon dioxide- waste from the body.

What does the Respiratory System

Do?

The Respiratory System Your body uses its

respiratory system to get oxygen from the air.

The major parts of your respiratory system include: nose and mouth, your trachea, your two lungs, and diaphragm.

The Respiratory System• Air enters the body through the nose

and mouth then travels down the trachea (the “windpipe,” or what connects your pharynx to your lungs)

• The trachea branches into two tubes called bronchi, which lead to the lungs.

• At the end of the bronchi are tiny tubes called alveoli, small air sacs.

• Carbon dioxide and oxygen are exchanged in the alveoli and the oxygen rich blood enters the body through the pulmonary veins.

The Diaphragm• The diaphragm is the

muscle that causes you to breathe. When you breathe in, your diaphragm expands (like a balloon). When you breathe out, your diaphragm contracts, or deflates.•hiccups are involuntary

contractions of the diaphragm

Image of the Respiratory System

What’s the Purpose? As the blood passes

through the lungs, it picks up the oxygen and takes it to the cells of the body, where the blood then picks up carbon dioxide and returns it to the lungs.

Let’s Review• The major parts of the

respiratory system include the nose/mouth, trachea, the lungs, and the ______________.• A. liver• B. diaphragm• C. esophagus• D. pancreas

Let’s Review• When you breathe in air,

you bring oxygen into your lungs and blow out:• A. hydrogen• B. carbon monoxide• C. oxygen• D. carbon dioxide

Let’s Review• When you inhale, your

lungs:• A. inflate• B. turn purple• C. make you sneeze• D. deflate

Let’s Review• What is the name of the

tiny air sacs located in your lungs?• A. Bronchioles• B. Ravioli• C. Alveoli• D. Bronx

Let’s Review• The trachea is also

called the _________.• A. lung• B. bronchius• C. diaphragm• D. windpipe

Let’s Review• The lungs bring ______

into the body, and eliminate _______ from the body.• A. oxygen, carbon dioxide • B. helium, nitrogen • C. carbon dioxide, oxygen • D. ketchup, mustard

Let’s Review• What is the main

function of the respiratory system?• A. to break food down• B. supply the blood with oxygen• C. circulate the blood

Let’s Review• Which part of the body

is not used for the respiratory system to work?• A. mouth• B. nose• C. small intestine• D. diaphragm