· The lungs store air.
· A tube called the windpipe connects the nose and lungs.
· The ribs protect the lungs.
· The nose also protects your lungs: the nose has little nose hairs that sweep back and forth and clean all of the bacteria that come into your nose.
· The ribs protect your lungs too.
· Only ten percent of your nose is cartilage.
· Every time you inhale your voice box gets bigger and you can talk longer.
· Your lungs are very soft but you can’t feel them because your ribs are in the way!
· If you spread the lungs out flat, they would provide enough parking spaces for seven cars
· You have 300,000,000 alveoli sacs in each lung.

Fun facts (5-10 cool, gross or unbelievable things you found out):
· Every time you breathe in you inhale 300 molecules of air previously breathed out by someone else.
· In our lungs, in a day, 8,000 to 9,000 liters of breathed in air goes to 8,000 to 10,000 liters of blood pumped in by the heart through the pulmonary artery.
· In an adult, 18,000 to 20,000 liters of air pass through the nose each day.
· The nose makes the air most so the lining of the lungs and bronchial tubes don’t dry.
· The nose warms up cold air to body temperature before it arrives in your lungs.
· When you are sleeping you breath two times less than when you are awake and doing things.
· There are tiny hairs called cilia that act like tiny brooms to sweep out the bad stuff caught in the mucus. Each cilium sweeps back and forth-about ten times every second, that's 36,000 every.
· The bronchial tubes also clean your lungs.

Respiratory System

The air you breathe goes down past your epiglottis, then down your trachea, and keep going down until it passes through your vocal cords in your larynx. Then it keeps going down to your bronchial tube. It comes to a fork in the One tube goes into your right lung, and the other goes into your left lung. The bronchial tubes go into your lungs and keep getting smaller until they get to the alveoli sacs. The red blood cells move the air to the other systems of your body. The main function of your Lungs is to change carbon dioxide to oxygen in the blood so it can take it to all parts of your body!
Your diaphragm is a muscular membrane that controls inhaling and exhaling. When you inhale or breathe in your diaphragm tightens. When you exhale or breathe out, your diaphragm is relaxing.
The purpose of breathing is to keep the oxygen high and the carbon dioxide low in the alveoli sacs so this gas exchange will occur.
This picture shows you how the carbon dioxide changes to air and goes into the blood cell. Breath about 20 times a minute

When we eat a flap called the epiglottis flops down to cover the windpipe so food does not go down your windpipe

Air has a long journey to get to the lungs. You breathe in through your nose &/or mouth. The air goes past your voice box (larynx) and vocal chords and down the windpipe, or trachea into your lungs. The trachea is like a hollow tube that is made up of cartilage and membrane. The windpipe (trachea) is about 1 cm wide and it extends down from the lower part of the voice box (larynx) for about 10 cm to a point where the lowermost ribs meet the center of your chest. There your windpipe divides into two smaller tubes, which lead to the lungs; the tubes are called bronchi, (one bronchus for each lung). The lungs are in the part of your body called the thorax, and are enclosed in your chest. The lungs sit inside your ribs and are covered by a membrane called pleura. The left lung has two parts to it called lobes (upper and lower). The right lung is divided into three lobes (upper, middle and lower). The right lung is larger, wider and heavier than the left because the heart is more on the left side. The right lung is also shorter than the left lung (by 2.5cm) because the diaphragm rises higher on the right side because of the placement of the liver. The bronchi branch off into smaller bronchial tubes

Info below from the website: http://kidshealth.org
From the outside, lungs are pink and a bit squishy, like a sponge. But the inside contains the real lowdown on the lungs! At the bottom of the trachea, or windpipe, there are two large tubes. These tubes are called the main stem bronchi, and one heads left into the left lung, while the other heads right into the right lung. Each main stem bronchus - the name for just one of the bronchi - then branches off into tubes, or bronchi, that get smaller and even smaller still, like branches on a big tree. The tiniest tubes are called bronchioles, and there are about 30,000 of them in each lung. Each bronchiole is about the same thickness as a hair.
At the end of each bronchiole is a special area that leads into clumps of teeny tiny air sacs called alveoli. There are about 600 million alveoli in your lungs and if you stretched them out, they would cover an entire tennis court. Now that's a load of alveoli! Each alveolus - the name for one of the alveoli - has a mesh-like covering of very small blood vessels called capillaries. These capillaries are so tiny that the cells in your blood need to line up single file just to march through them.

The alveoli bring new air from the air breathed to the bloodstream.