gas exchange

Question	Answer
What is breathing in also known as ?	inhalation
What is breathing out also known as ?	exhalation
The lungs contain many air sacs , what are they called ?	alveoli
How are alveoli adapted to allow for gas exchange ?	1. they are moist 2. good blood supply 3. provide a large surface area for gas exchange 4. the wall of the alveoli is just one cell thick
describe the percentages of the different gasses before we breath air in?	nitrogen 78% oxygen 21% carbon dioxide .04%
describe the percentages of the different gasses after we breath out	nitrogen 78% oxygen 17% carbon dioxide 4%
explain why the composition of gases are different before and after we breath ?	their is less oxygen after we breath out because it is used up during respiration and more carbon dioxide because this is produced during respiration
What is the trachea ?	The trachea is a tube that is made of rings of cartilage. It carries air that you breath in to the lungs.
What is the bronchus ?	The trachea branches into two tubes called the bronchi. Each bronchus goes into each lung.
What are the bronchioles ?	The bronchi split into a network of smaller tubes called bronchioles that spread through out the lungs
what is the diaphragm ?	the diaphragm is a muscle tat sits under the ribcage. It moves up when it relaxes and down when it contracts.

Resource summary

	Created by david doran about 8 years ago