Respiration

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Why does the space in your chest get bigger?

As the space in the chest get bigger, it contracts a muscle that lets air flow in to the lungs.
Why is it important for the alveoli to have a large surface area?

This allows enough oxygen to pass into the blood because more can pass through at once with a larger surface area.
Why are the walls of the alveoli and the capillaries thin?

So that it allows oxygen to pass through into the blood and carbon dioxide to go into the alveoli
What gas is mostly in the air?

nitrogen
Why do water droplets form on a window

The air contains water vapour. When the air hits something that is cooler, the water vapour in the air cools and condenses.
Does air that we breathe out have more or less oxygen and carbon dioxide

more carbon dioxide, less oxygen
Why do we have cartilage in the trachea

It makes it a lot stronger and keeps the airways open
What does mucus and cilia do?

Mucus traps bacteria and cilia move the mucus so it can be swallowed
What does cigarette smoke do to the cilia

paralyses them
What word is used to describe cells that work together in a group

tissue
When a person smokes, more mucus is made and cilia is damaged, What is the consequence

There will be a build up of mucus because the cilia will not be able to move it and there will be more being produced so the person will probably develop a really bad cough.