This blog will be used to highlight the basic human body systems, to enlighten you by giving you the basic information of how those systems fuction
Wednesday, July 18, 2012
In relation to the breathing system
Gas exchange in the lungs
Breathing in supplies us with oxygen needed for cellular respiration, while breathing out removes waste carbon dioxide from our body, air is breathed to the lungs oxygen passes into the blood by diffusion (movement of molecules or particles from regions of higher concentration to regions of lower concentration)along a concentration gradient. At the same time, carbon passes out of the blood into the air of the lungs also by diffusion along a concentration gradient. This gas exchange takes place in the alveoli which are the tiny are sacs with large surface area that make up much of the structure of the lungs. The movement of oxygen into the blood and carbon out of the blood take place at exactly the same time-there is swap or exchange between the two, so this process is known as gaseous exchange.
Gas exchange in Alveoli
Air in the lungs ends up in the alveoli which are tiny air sacs that provide an ideal site for most effective possible diffusion. They have a large surface are which is always kept moist. This is effective for most effective diffusion of the gases. The alveoli also have a rich blood supply so that a concentration gradient is maintained in both directions, oxygen is removed into the blood and more carbon dioxide is delivered to the lungs. This makes sure that the gas exchange can take place along the steep concentration gradients for it to occur as rapidly as effectively as possible.
1- Explain fully, the function of the lungs, alveoli, diaphragm and ribs
2- True or false :
a) The breathing movements do not cause change in the volume only in the pressure of chest during ventilation.
b) The movement of air is brought about by both the ribs and the diaphragm.
c) Oxygen in the lungs from the air diffuses into the blood stream a while after carbon dioxide from the blood diffuses out of the bloodstream into the air.
d) The alveoli provides a very large moist surface area, richly supplied with blood capillaries to allow most efficient possible gas exchange.
- Fullick, Ann (2001). Biology for AQA. Chicago: Heinemann Educational.
- Brain, J. D. (2006, August). The merck manual home health handbook. Retrieved from http://www.merckmanuals.com/home/lung_and_airway_disorders/biology_of_the_lungs_and_airways/exchanging_oxygen_and_carbon_dioxide.html
- Tamarakin, D. (2011, October 9). Stcc foundation press. Retrieved from http://faculty.stcc.edu/AandP/AP/AP2pages/Units21to23/respiration/alveolar.htm
- Peter. (2012). Anaerobic respiration articles. Retrieved from http://www.anaerobicrespiration.net/general/simple-definition-of-aerobic-and-anaerobic-respirations/