the respiratory system. 1 2 3 4 5 8 6 7 trachea / wind pipe lung rib bronchus diaphragm air sacs /...
TRANSCRIPT
Alveoli / Air SacsThis is where gas exchange happens...
• Oxygen diffuses into the blood• Carbon dioxide diffuses out
Air SacsThis is where gas exchange happens.
Oxygen diffuses into the blood.
Carbon dioxide diffuses out.
Gas exchange• Gas exchange occurs in the alveoli of the lungs• Oxygen diffuses into the blood• Carbon dioxide diffuses out
blood in
blood out
CO2
O2
AlveoliAlveoli are good at gas exchange because:
• They have a large surface area• They have a good blood supply• Their lining is moist• They are very thin
This means a lot of diffusion can happen quickly!
Why do veins look blue?
Why is blood red?Haemoglobin, found in red blood cells, carries oxygen around the body.
Haemoglobin contains iron which looks bright red combined with oxygen.
Nice dissection video
http://www.bbc.co.uk/scotland/learning/bitesize/standard/biology/the_body_in_action/the_need_for_energy_rev3.shtml
What stops things getting into your lungs?
Mucus and Cilia
http://www.youtube.com/watch?v=miEEluVlemQ
Respiratory System• Trachea and bronchi are lined with:
– Rings of cartilage for support; prevents tubes closing– Mucus to trap dirt and germs– Cilia (tiny hairs) to sweep mucus out of the lungs
BreathingBreathing is not the same as respiration.
Respiration is a chemical reaction.
Breathing is the process of moving air in and out of the body.
BreathingWhen you breathe in what happens to...
• Your ribs?• Your diaphragm?• The volume of your lungs?
Lung Measurements
Tidal volume: the volume of air you move in and out of your lungs when breathing normally
Vital capacity: this is the maximum volume of air you can move out of your lungs
Peak flow: this is the maximum rate which you can force air out of your lungs
Tidal volume
Vital capacity
Peak flow
the maximum volume of air you can move
out of your lungs
the maximum rate which you can force air out of your lungs
volume of air you move in and out of
your lungs when breathing normally
How long can you hold your breath?
The man who can hold his breath for 10 minutes!
http://www.youtube.com/watch?v=9Vcv01Jm-Ow
What factors might affect lung measurements?
What might cause someone to have a bigger or smaller vital capacity?
• http://www.ltscotland.org.uk/glowscience/human_body/lungs/film_151/index.html
Respiration
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/RPRLC/launch.html
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/CRBLC/launch.html
Alveoli
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/AOALC/launch.html
Mucus
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/MUMLC/launch.html
Respiratory System
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/TRSLC/launch.html
Gas Exchange
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/GEXLC/launch.html
Air
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/GEXLC/launch.html
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/DNXLC/launch.html
Breathing
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningsteps/BRVLC/launch.html
• http://lgfl.skoool.co.uk/content/keystage3/biology/pc/learningSimulations/BRVSC/launch.html
Alveoli• http://subscription.echalk.co.uk/Science/
biology/breathing/RespiritorySystemLabelling/RespiratoryLabel.html
Respiratory System• http://subscription.echalk.co.uk/Science/
biology/breathing/RespiritorySystemLabelling/RespiratoryLabel.html