Primary purpose of supplying your blood with oxygen

Also has the purpose of removing Carbon Dioxide from your blood and releasing it to the outside

Without the removal of CO2, we would only live a short time before poisoning ourselves

Every breath we take in is made up of:◦ 78% Nitrogen◦ 21% Oxygen◦ 0.96% Argon◦ 0.04 % Mixed Gases

Every breath we take out is made up of:◦ 78% Nitrogen◦ 16-17% Oxygen◦ 4-5% Carbon Dioxide minus 4-5% oxygen◦ 0.96% Argon add 4-5% carbon dioxide◦ 0.04% Mixed gases

In Pairs, one of you grab a beaker labeled A, and the other grabs one labeled B

Grab a straw each, gently blow 5 deep breaths into tube B – the do the same to A.

What happens?

Inside the test tube contains an indicator called Bromothymol Blue

This will show the presence of Carbon dioxide by changing colour.

Is the process of moving air in and out of your lungs

On average we breath 20-24 time per minute

http://www.youtube.com/watch?feature=endscreen&NR=1&v=zlH0o9MZVmI

We are able to breathe because the muscles of our ribs and diaphragms◦ These muscle contract when we breathe in—this

causes the ribs to move up and the diaphragm to move down

This expands our chest size and brings air in

◦ When you exhale these muscles relax, this decreases the size of your chest and pushes air out

Air is drawn into the body through the mouth or nose

Little CILIA hairs are present in the airway that grab particles that can be harmful

The mucus of the nose filters the air and the blood warms the air

This action causes the chest to expand and opens room for the lungs to bring air in

After the air is breathed in by the nose or mouth it moves to the Pharynx◦ Common air and food passage way

◦ Then goes down the Larynx which leads to the TRACHEA

◦ The larynx contains the voice box

When you eat the larynx is closed off by a flap of skin called the epiglottis

It reopens when you breathe

Also known as your wind pipe

This is the tube that the air follows after it is breathed in by the mouth or nose

This tube leads the air to the Bronchial Tree

Tough connective tissue that lead air into the lungs

Main purposes is to lead the air into the lungs and prevent the lungs from collapsing on themselves as they deflate

The bronchi tubes narrow out and split into separate tubes known as the bronchioles

Bronchioles are tube like sections that lead to tiny air filled sacs called Alveoli

There are about 600,000,000 alveoli in the lungs of a human.

These are surrounded by capillaries that transfer oxygen and carbon dioxide

Alveoli are made of one-cell thick tissue.◦ Diffusion becomes very critical in this stage

The air in the alveoli has:◦ High concentration oxygen, low concentration of

CO2

◦ The blood in the capillaries arround the alveoli have low oxygen concentration and high CO2

◦ Oxygen diffuses one way, CO2 diffuses the other

◦ This whole process take ONE SECOND to complete

The air you breathe has oxygen that is transferred into the blood and is then brought all over the body for use.

The Carbon dioxide is transferred into the alveolis from the blood

Asthma

Smoking

Mucus build up in the broncial tubes limits the ability to get air into the lungs

Puffers clear away the mucus build up to ease breathing

Smoke damages the lung tissue, paralyzes cilia to allow harmful substances into the lungs

WARNING!!! GRAPHIC PICTURES AHEAD!!!