Describe the gas exchange in the lungs?

Answer 1

Gases as a law exist independently of each other

Gases move rapidly and randomly

So in the alveoli (lungs air bags) we have "fresh" air entering this has Approx 80% Nitrogen 19%oxygen and a little carbon-di-oxide and other gases.

In our blood we have high carbon-di-oxide levels in the air we have low carbon-di-oxide levels and vice versa for oxygen

If you have smelled perfume and noticed that you can smell it from far away that's a result of diffusion.

Effectively the respiratory gases diffuse to equalize in concentration in both the blood and in alveoli. Basically in blood (deoxygenated) CO2 concentration is 50 mmHg in the air sacs it is 45 mmHg so they try t equalize.

This results in carbon-di-oxide leaving the blood and entering the alveoli.

The same thing happens to the oxygen. It's higher in air than in blood so the oxygen moves from high concentration (in air) to low concentration (in blood)

The end result is carbbon-di-oxide leaving blood and oxygen entering blood this is a basic!!! overview of the gas exchange.

Easiest answer: Capillary

Answer 2

The gas exchange within the lungs is primarily affected by the partial pressures exerted by the different gases in the alveoli - the basic functional unit of the lungs. gas exchange is always linked with the function of the circulatory system. here is how it takes place:

1. You breathe in oxygen - which in turn increases the PaO2 in the alveoli causing it to diffuse in the alveolar membrane into the capillaries surrounding it

2. Waste products coming from the different cells of the body (in this case carbon dioxide) is transported until it reaches the alveolar capillaries. in this case the blood is oxygen depleted that is carbon dioxide rich which makes the partial pressure exerted by carbon dioxide is greater than that of oxygen as a result, Carbon dioxide diffuses from the capillaries into the alveoli and is exhaled.

3. Remember also that this process occurs simultaneously. I would suggest also that you master the route of the blood during circulation. hope this made things clearer for you.

Answer 3

The nose and mouth- Air can enter the body through either the nose or mouth. the nose and mouth are separated by the palate. the air then passes through the windpipe or trachea. at the top of the trachea is a piece of cartilage called the epiglottis. this closes the trachea and stops food from going down the trachea when you swallow. the trachea goes down through the neck and into the thorax. the thorax is the upper part of your body from the neck down to the bottom of the ribs and diaphragm. in the thorax the trachea is divided into two. the two branches are called the right and left bronchi. one bronchus goes to each lung and then branches out into smaller tubes called bronchioles. at the end of each bronchiole are many tiny air sacs or alveoli. this is where the gas exchange takes place.

Answer 4

Gas exchange is a process and what happens is that there is a pick up of oxygen and a release of carbon dioxide in the alveoli