Comments on: Why???????????????????????

By: rawr

rawr — Sun, 20 Dec 2009 16:59:03 +0000

i’m too lazy to answer those for you but you could easily get all that information off of google.

By: Katie

Katie — Sun, 20 Dec 2009 16:11:33 +0000

1. Diaphram
2. Lungs, veins, arteries, heart
3. arties – arterolles – capillaries – venuoles – veins – superior vena cava – inferior vena cava – right atrium – tricuspid valve – right ventricle – pulmonary semilunar valve – pulmonary aretery – right and left lung – pulmonary veins – heart – left atrium 0 bicuspid valve – left ventricle – aortic semilunar valve – aorta – all ovver the bodyy
4. absorbd
5. REALLY depends how in depth you want.
6. prevents dust, particles and bacteria from enterng
7. carbon dioxide, some oxygen and some water

By: Unknown Essence

Unknown Essence — Sun, 20 Dec 2009 15:50:49 +0000

1. Diaphragm – During inhalation, the diaphragm contracts, reduces pressure in the lungs that sucks air into it.
2. * Posterior
* Nasal cavity
* Pharynx
* Larynx (voice box)
* Trachea (wind pipe)
* Thoracic cavity ( basically ur chest)
* Bronchi
* Alveoli
This order.
3. As your diaphragm contracts it reduces the air pressure in the lungs and causes a ’suction’ that makes all the air flow into your lungs… through the bronchi etc and to the alveoli.
4. Oxygen gets into the blood via the alveoli. when the concentration of carbon dioxide in the blood near the alveoli is greater than the concentration of oxygen, the oxygen diffuses across the concentration gradient, and the carbon dioxide does the same. You then exhale.
5. The lungs are a pair of sponge like organs in the chest. Within the lungs there are two tubes that go left and right. The bronchi. Each of these bronchi then divide into smaller bronchioles. At the end of bronchioles there is the alveoli, tiny air sacs where the exchange of oxygen and Carbon dioxide takes place.
6. In a normal person mucus in the lungs helps get rid of bacteria and germs in the air that we would normally inhale (people with cystic fibrosis produce too much mucus and it is more viscous than normal )
7. Carbon dioxide is the waste gas that leaves the lungs but also a small ammount of oxygen is exhaled aswell (main ones you need to know)