Alveoli

diffusion

a good thing to do is to use loose fitting underwear

Oxygen in the alveoli is picked up by hemoglobin in erythrocytes (red blood cells) in the capillaries of an alveolus. The erythrocytes then travel back to the heart through the pulmonary vein and gets pumped to the rest of the body through the left atrium, left ventricle, and the aorta.

Through water. Oxygen can not be transferred out of the lungs and into the blood without passing through water.

You have 1,596,029.

the blood surround Alveoli in order to gas exchange between the Alveoli and red blood cell.

Humans are much larger so they have small surface area which creates a greater distances to move the oxygen (O2) & carbon dioxide (CO2), so a special respiratory surface (LUNGS) is needed as well as an internal transport system (CIRCULATORY SYSTEM).

True

The alveoli are completely covered in blood vessels (capillaries). The walls of the capillaries are extremely thin and the distance between air and blood is only 0.3μm.

This means that O2 has no distance to travel to get into the blood. The alveoli increase the surface area hugely. Humans have 300 million alveoli in both lungs giving a total surface area of 80 m2 (The skin is 2m2).

because it does

The alveoli branch from the bronchioles and are responsible for gas exchange with the pulmonary capillaries. They come in close contanct with the capillaries so the exchange of O2 and Co2 can occur rapidly and easily.

Villi are in the small intestine and alveoli are in the lungs. They both work by diffusion.

these are the pipes by which oxygen enters the lungs and co2 exits

With each inhalation, air fills a large portion of the millions of alveoli. In a process called diffusion (pronounced: dih-fyoo-zhun), oxygen moves from the alveoli to the blood through the capillaries (tiny blood vessels, pronounced: kah-puh-ler-eez) that line the alveolar walls. Once in the bloodstream, oxygen gets picked up by a molecule called hemoglobin (pronounced: hee-muh-glo-bun) in the red blood cells. This oxygen-rich blood then flows back to the heart, which pumps it through the arteries to oxygen-hungry tissues throughout the body.

Yes. Alveolus is composed of many cells that work for a common function, to take out carbon dioxide and oxygenate the blood.

Surfactant

I believe it might be HEMOGLOBIN.

A product of the lung tissues called surfactant keeps the tiny alveoli open.

Emphysema, which is a part of COPD - Chronic Obstructive Pulmonary Disease
Chronic Obstructive Pulmonary Disease (COPD) and emphysema.
Called "barrel chest"; usually caused by chronic pulmonary emphysema.
Chronic Obstructive Pulmonary Disease (COPD) and emphysema.
Pulmonary emphysema

They have capillaries close to their surfaces.

about 300 million

deoxygenated blood

Air is expelled from the alveoli, as well as the lungs in general, during exhalation when the diaphragm relaxes and rises up. This creates pressure on the thoracic cavity, and since there is more air pressure inside than outside, the air is exhaled to relieve the pressure.

Its structure is that of a balloon, and that helps it function during inhalation because it opens up to allow air to make contact with a large area to perform gas exchange.

The structure of the alveoli is that there are blood vessels wrapping around them. Then, oxygenin from the alveoli can enter the blood. The blood will give oxygen to all the body's tissues, and later, in the alveoli, carbon dioxide or CO2 can leave the blood and be exhaled. So, together, the alveoli, wrapped up by blood vessels, can bring oxygen to the rest of the body and also get rid of all the carbon dioxide.