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.
The capillaries surrounding the alveoli at the ends of the bronchioles in the lungs.
In the capillaries surrounding the alveoli.
The respiratory and circulatory systems are involved in the exchange of gases between the alveoli and blood. The alveoli are part of the lungs, and their surrounding capillaries are part of the circulatory system.
Simply put, the gas exchange occurs in the lungs. More specifically, the blood exchange occurs at the avoli, the "air sacs" in the lungs where the surrounding capillaries can be oxygenated.
as it moves through blood vessels capillaries in the alveoli walls, your blood takes oxygen from the alveoli and gives off carbon dioxide to the alveoli
It diffuses into the blood capillaries surrounding the alveoli.
capillaries
It is very important that they cover you alveoli
In the capillaries surrounding the alveoli in the lungs
They are present in the lung surrounding the alveoli.
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).
The smallest blood vessels of the body = capillaries
the blood surround Alveoli in order to gas exchange between the Alveoli and red blood cell.
Human gas-exchange occurs in the lungs. Once air enters the lungs, diffusion of O2 and CO2 occurs in the alveoli.
The capillaries surrounding the alveoli at the ends of the bronchioles in the lungs.
In the alveoli
Blood capillaries surrounding air sacs called alveoli.