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What blood vessels do the exchange of gases occur?
the blood vessel which allows gas exchange to occur is the capillaries
Why are lung alveoli covered with blood capillaries?
The Alveoli in the lungs have a very good capillary network because this is where gas exchange occurs. There needs to be sufficient area to allow the red blood cells to expel their carbon dioxide and to receive oxygen across the capillary and alveoli walls.
What is relationship of the alveoli to capillaries?
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.
One reason why it is easy for gases to pass across the walls of the alveolus?
The walls of the alveolus are very thin, allowing gases to easily diffuse across them. Additionally, the alveoli are surrounded by a dense network of capillaries, increasing the surface area available for gas exchange.
What kind of blood vessels allow substances to enter and leave the blood easily around the cells?
Capillaries. they have such thin walls that substances can easily diffuse through them.
What are the characteristics of gas matter?
gas matter's characteristics is GAS
Why does oxygen diffuse in and carbon dioxide diffuse out?
In the alveoli, oxygen diffuses into the blood that the capillaries carry due to a concentration gradient that exists there as oxygen conc is higher in the alveolar sacs than in the blood capillaries. Similarly carbon dioxide diffuses out of the blood capillaries into the alveolar sacs down the concentration gradient. The constant flow of blood is there to ensure this concentration gradient is established at all times.
Oxygen and carbon dioxide pass back and forth between the alveoli and the blood through?
The process of simple diffusion. Oxygen moves from the alveoli into the blood where it binds to hemoglobin in red blood cells, while carbon dioxide moves from the blood into the alveoli to be exhaled out of the body.
Why does the walls of the capillaries and the alveoli have to be thin?
If their walls are too thick, substances like oxygen and nutrients and waste cannot pass across the cells into or out of the body.
What allows oxygen in and waste out?
As oxygen enters the body it will travel down the trachea (throat), through the bronchioles (tubes leading to the lungs), and into the lungs. In the lungs there are very tiny grape-like-sacs called alveoli. The membrane on these sacks is very thin, and they are surrounded by many tiny capillaries (blood vessels) whose membrane is also very thin. It is here where oxygen from the alveoli enters the capillaries, and carbon dioxide (waste product) from the capillaries enters the alveoli. The oxygen is now carried through the blood to the heart where it is pumped throughout the body, and the carbon dioxide, now in the alveoli, is expelled as the person exhales. In a situation of altitude it is this process that is hindered. Because of the lower pressure of oxygen the oxygen does not enter the capillaries as easily and the body is deprived of oxygen.
How gaseous exchange take place in the alveoli?
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.
What is the definition of the transfer of oxygen?
Your lungs are made up of tiny sacks called alveoli. They have a very large surface area and a thin membrane so that dissolved substances, mainly the oxygen you breathe in, can pass through (or diffuse) easily. The dissolved oxygen diffuses through the alveoli membranes into the blood capillaries that run over them, and therefore the oxygen gets into your bloodstream. The heart then pumps around the newly re-oxygenated blood, which then diffuses into your cells and allows your body to respire, or use energy.
