Alveoli

1.They are single cell thick

2.Thin film of moisture covering the alveoli allows the oxygen to dissolve in therefore making the process efficient

3. they have a large surface area

4.they are surrounded by network of blood capillaries maintaining the concentration gradient for the gaseous exchange

*IT* Doesnt

Emphyesma is when alveoli die.

how does it affect them...

Well it would affect them like it affects every other cell in the body.

(decreased O2)

but it acually doesnt affect the alveoli

it just happens

when they die

Interfering with the cohesiveness of water molecules, thereby reducing the surface tension of alveolar fluid.

It is the process of simple diffusion. The movement of oxygen from a high level (in the air) to a lower level (in the blood). The opposite occurs for carbon dioxide which is higher in the blood but lower in the air.

Oxygen moves into the blood because the partial pressure of oxygen is higher in air and lower in blood. Carbon dioxide moves out of the blood because the particle pressure of carbon dioxide is higher in blood and lower in air.

Air enters trachea (wind pipe) via nostrils. From trechea it goes into left and right bronchus. It is then channeled into progressively narrower channels and finally it reaches alveoli where gaseous exchange occurs. This whole event is assisted by movement of diaphragm and of ribs.

When you inhale, air fills the alveoli and oxygen passes from the alveoli through a semipermeable membrane and into the capillaries, leading into the bloodstream. During the same process, carbon dioxide is outgassed from the blood to the alveoli

When you inhale, air fills the alveoli and oxygen passes from the alveoli through a semipermeable membrane and into the capillaries, leading into the bloodstream. During theWhen you inhale, air fills the alveoli and oxygen passes from the alveoli through a semipermeable membrane and into the capillaries, leading into the bloodstream. During the same process, carbon dioxide is outgassed from the blood to the alveWhen you inhale, air fills the alveoli and oxygen passes from the alveoli through a semipermeable membrane and into the capillaries, leading into the bloodstream. During the same process, carbon dioxide is outgassed from the blood to the alveoli foli same process, carbon dioxide is outgassed from the blood to the alveoli

When we exhale /blow out we push out all the carbon dioxide in our lungs!

There are many little air sacs instead of big air sacs because in order to breathe you have to have air sacs spread around the whole entire lungs to breathe correctly!

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Frederika Rubio

rm.22

Mrs.Feinberg

The Great (Type 2) Alveolar cells secrete pulmonary surfactant and prevent the cells from collasping.

Gas is exchanged by diffusion.

We have followed the path of the air and of the oxygen into the bloodstream. But breathing is a two-way street: we breathe in and then we breathe out. When we breathe in, or inhale, oxygen is removed from the air. Breathing also removes waste from the lungs and from our noses and mouths. How does this waste material get into the air that we breathe out, or exhale?

The thin walls of the alveoli actually have two purposes. When we breathe in, oxygen passes through the walls of the alveoli and into the blood. Carbon dioxide and water vapor then travel the opposite direction. They are the main waste products that pass from the blood vessels (arteries) in the lungs, into the alveoli, through the windpipe and out the nose and mouth.

In the alveoli, oxygen crosses over into the blood stream and carbon dioxide leaves the blood stream and enters the alveoli to be expelled through the lungs.

The heart is constantly pumping blood around the body.

blood entering the lungs is deoxygenated and high in C02

The air in the alveoli has a high oxygen concentration and in comparison is low in C02

This sets up a concentration gradient.

This causes oxygen to diffuse into the RBC and C02 to diffuse out in order to try balance the concentration.

This balance is maintained by breathing, taking away the C02 in the lungs and bringing in fresh O2 and the constant pumping of blood, bringing more deoxygeneate blood into the lungs

i KNOW ONLY 2. They are : Carbon dioxide & excretory products

The alveoli have high concentrations of oxygen, especially when compared to venous blood. This concentration gradient is why oxygen diffuses across the alveolar wall into the bloodstream.

Oxygen is exchanged for carbon dioxide.

Air. Alveoli are air sacs on the end of bronchioli. Gas exchange of carbon dioxide and oxygen occurs through the alveoli.

asthma

Alveoli does not collapse because lungs always have a residual volume which prevents the alveoli to collapse.

Large surface area due to the combined spherical shape (600 million alveoli = 80 m2)

Flattened epithelial cells of alveoli and close association with capillaries

Short diffusion distance from alveoli to blood (0.5-1.0 um)

Dense capillary network

Moist surface for the solution of gases

Carbon dioxide ;D and carbon dioxide leaves it. 8)

lungs

The wall is thin to allow rapid andefficient diffusion across of O2 into the blood and CO2 into the alveolar space (the air). It is moist for many reasons but primarily because diffusion in this form must be in slution.

The alveoli is the point where the waste product of respiration (carbon dioxide) and oxygen are diffused into or out of the blood. Oxygen diffuses into the blood stream and are carried to the heart and carbon dioxide is diffused out of the lungs and expired. The alveoli have moist walls and are close to the capillaries which speeds up the process.