How do you descirbe how gas exchange in the air sacs?
Well i do not get this may you help me !
http://www.howstuffworks.com/lung.htm
Of course, I'd be happy to help explain how gas exchange occurs in the air sacs of the lungs!
Gas exchange in the air sacs, also known as alveoli, is the process by which oxygen from the inhaled air enters the bloodstream, while carbon dioxide, a waste product, is removed from the bloodstream and expelled from the body during exhalation.
Here's a step-by-step explanation of how this process occurs:
1. Inhalation: When we breathe in, air enters our respiratory system through the nose or mouth. It then travels down the windpipe, or trachea, and enters the bronchial tubes, which are small airways that branch out in the lungs.
2. Alveoli: These bronchial tubes further divide into tiny structures called bronchioles, which ultimately lead to the alveoli. Alveoli are small, balloon-like air sacs surrounded by networks of capillaries, which are tiny blood vessels.
3. Diffusion: In the alveoli, oxygen from the inhaled air passes through the thin walls of the air sacs and into the surrounding capillaries. This process is called diffusion and occurs due to the concentration gradient between the high oxygen concentration in the alveoli and the low oxygen concentration in the bloodstream.
4. Oxygen transport: Once oxygen diffuses into the capillaries, it binds to a protein called hemoglobin in the red blood cells. Hemoglobin carries oxygen to tissues throughout the body, where it is used for cellular respiration.
5. Carbon dioxide exchange: At the same time, carbon dioxide, which is a waste product produced by cells as part of their metabolic processes, passes from the tissues into the bloodstream. It then travels through the capillaries and diffuses from the blood into the alveoli. From there, it is exhaled out of the body during exhalation.
Overall, gas exchange in the air sacs relies on the diffusion of oxygen from the alveoli into the bloodstream and the diffusion of carbon dioxide from the bloodstream into the alveoli.
If you would like to learn more about this topic, you can also visit the link you provided: http://www.howstuffworks.com/lung.htm. It provides a detailed explanation of the respiratory system and gas exchange in the lungs.