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
Thursday, July 12, 2012
How is air brought to lungs?
The job of the breathing system is to continually move air into the lungs and then move it out again. This is brought about by movement of the ribcage which we feel, and by movements of the diaphragm which unfortunately we cannot feel nor see. When we breathe, our ribs move up and out, and the muscles of the diaphragm contracts so it flattens from its normal domed shape thus pulls air into the lungs. However, when we breathe out what happens is that the ribs move in and down and the diaphragm returns back to its domed shape, forcing air outside of the lungs.
This movement of air in and out of the body is known as ventilation
Ventilation as part of the breathing system
The breathing movements are brought about by two different sets of muscles which change the pressure in the chest cavity. The intercorsal muscles between the ribs contracts pulling them upward and outward at the same time as the diaphragm muscles contract to flatten the diaphragm. These two movements increase the volume of the thorax and because the same amend of gas is now inside a much bigger space, the pressure inside the chest. This in return means the pressure inside chest is lower than the air outside therefore as a consequence, air moves into the lungs. Then, both the intercorsal and diaphragm muscles relax, the ribs drop and diaphragm domes up. The volume of the thorax is decreased and so the pressure inside the chest increases causing air to be squeezed and forced outside the lungs.
1- How are the lungs adapted to allow gas exchange to take place as effective as possible?
2- What is the difference in composition between inspired and expired air?
3- Explain fully how air is moved in and out of the lungs in human’s respiratory system?
- 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/