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The size of the capillary is smaller than the red blood cells. The exact reason for this is not known. The red blood cells get folded when they pass through the capillaries. This phenomena buy time for the blood to flow through the capillaries, probably. Secondly it will create larger surface area of total number of capillaries to flow the same amount of blood. You have better exchange of gases through larger surface area.

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Q: Why is the small size of the capillaries surrounding the alveoli important physiologically?
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What does the oxygen molecule do when it is in the alveoli?

It diffuses into the blood capillaries surrounding the alveoli.


The blood vessels surrounding the alveoli are?

capillaries


Is it important that capillaries cover the alveoli?

It is very important that they cover you alveoli


Where does the oxygen pass into the blood in the breathing system?

In the capillaries surrounding the alveoli in the lungs


What part of the lung does capillaries flow through?

They are present in the lung surrounding the alveoli.


Why alveoli in the lungs have large surface area and many blood capillaries surrounding the?

The alveoli provide large surface area for the exchange of gases between the blood and the air. Each alvoeli is surrounded by many capillaries(tiny blood vessels). The very thin walls and large surface area of the alveoli and numerous capillaries surrounding them enable gases to be exchanged quickly and efficiently. Oxygen in the inhaled air diffuses from the alveoli to the blood in the capillaries. The blook then carries the oxygen to the cells in the other parts of the body. The waste product of respiration, CO2 , diffuses from the blood to the lungs through the capillaries surrounding alveoli. It leaves the body through bronchi and trachea when you exhale( breathe out).


Are arteries founf surrounding alveoli?

The smallest blood vessels of the body = capillaries


What are alveoli surrounded by?

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


Where in the human body is o2 and co2 exchanged?

Human gas-exchange occurs in the lungs. Once air enters the lungs, diffusion of O2 and CO2 occurs in the alveoli.


Which part of the respiratory system exchanges oxygen and carbon dioxide?

The capillaries surrounding the alveoli at the ends of the bronchioles in the lungs.


Does the carbon dioxide travels into capillaries alveolar and out of the capillaries at the tissue?

In the alveoli


What takes oxygen from the air into the blood?

Blood capillaries surrounding air sacs called alveoli.