As we inhale air, oxygen enters the respiratory system and the circulatory system to transport it to the other parts of the body and to all cells. As the oxygen is already transported, the blood becomes deoxygenated and carries a CO2 which returns to the lungs and then we exhale the carbon dioxide.
Animal cells are able to move because they do not have a cell wall like a plant does. Hope this helps, good luck!
Infectious Disease Epidemiology Programs primary purpose is to study the ... <span>Contact Diseases</span> are transmitted when an infected person has direct bodily contact with an ... are found on the skin but do not cause illness it is called " colonization. ... a bacterium found in rodents and their fleas in many areas around the world.
The disease is mainly caused by a lack of a slippery substance in the lungs called surfactant. This substance helps the lungs fill with air and keeps the air sacs from deflating. Surfactant is present when the lungs are fully developed.
https://medlineplus.gov/ency/article/001563.htm
