Flashcards
Respiratory and Gaseous Exchang
Cards in this deck (23)
- 1Breathing/VentilationThe process that moves air in and out of the lungs.
- 2Gaesous ExchangeThe exchange of O2 and CO2 at the lung's surface
- 3RespirationThe chemical process that takes place in every living cell which releases the energy stored in glucose molecules
- 4Diffusion in Gaseous ExchangeDiffusion is the NET movement of particles from a region of THEIR high conc to THEIR low conc DOWN the CONC GRADIENT as a result of their RANDOM MOVEMENT
- 5How to inc rate of Diffusion-inc temp
-inc SA:V
-inc conc gradient
-reduce distance of diffusion pathway - 6How lungs inc rate of Diff-alveoli, only 1 cell thick, so diffusion pathway is small
-millions of folded alveoli inc SA:V
-ventilation helps maintain a steep conc gradient
-rich blood supply also helps maintain a steep conc gradient - 7diagram of lungs
- 8EpiglottisA flap which closes over the TRACHEA when swallowing food so that food and liquid do not enter the LUNGS
- 9TracheaA tube held together by RINGS of CARTILAGE. The tube is lined with SCILIA and covered in MUCUS to trap and remove DUSTand MICROBES to the back of the throat for swallowing.
- 10Bronchi and BronchiolesThe trachea branches to form many smaller and smaller tubes to inc the SA:V of the lungs
- 11AlveoliMillions of tiny folded air sacs to inc SA:V. They are covered in tiny capillaries to maintain a steep CONC GRADIENT.
- 12Intercostal MusclesThese CONTRACT to pull the ribs up and down when INHALING to incvolume of the thorax.
- 13RibsForm a rib cage to PROTECT the lungs. these are pulled up during INHALEMENT and drop back during EXHALEMENT
- 14DiaphragmThis large muscle CONTARCTS and FLATTENS when INHALING to inc the volume of the thorax. this cause air to move int the lungs. When it relaxes it returns to a DOME SHAPE which dec the volume of the thorax. this cause air to move OUT of the lungs.
- 15Rings Of CartilageThese are incomplete, C-shaped hoops pf cartilage in the trachea, the opem part facing the oesophagus and allowing it to bulge slightly during swallowing
- 16Scilia-The trachea, bronchi and the larger bronchioles are lined with a ciliated epithelium.
-Cilia moves mucus from the lungs and trachea to pharynx where it is swallowed.
-Goblet cells are found in ciliated epithelium of the trachea, bronchi and larger bronchioles - 17Goblet cells produce mucusMucus traps stuff like microbes and fine dust particles
- 18After exercise the volume of air breathed out would be greater than before exercise because the rate of repiration was increaded to increase the amount of energy needed for exerciseAfter exercise the volume of CO2 in air breathed out is greater due to an increased rate of respiration more co2 is produced which diffuses and travels in the plasma and diffuses into the alveoli increasing the conc which resultrs in more co2 given off
- 19explain why a large amount of O2 enters the blood- alveoli have a large SA:V
-this inc rate of diffusion
-alveolar wall and capillary wall only 1 cell thick
-thus reducing the diffusion pathway
-alveoli have a rich blood supply which maintains a steep conc gradient
- Inhalation and Exhalation also help maintain a steep conc gradient - 20AsthmaIn an asthmatic attack, the fine tubes leading to the alveoli getting narrower. This reduces air flow into and out of the alveoli
- 21EmphysemaThis disease is also caused by long term irratation of the lungs, such as by smoking, air pollution or industrial dust. it results in the breakdown of the walls of the alevoli. This reduces their surface area.
- 22Chronic BronchitisThis disease is caused by long term irritation to the lungs, such as by smoking. The irritation causes cells in the lungs to produce much more mucus than usual. The mucus blocks fine tubes in the lungs, reducing the amount of air that can get to and from the alveoli.
- 23PneumoniaSome bacterial and viral infections can cause toxins and fluids to be released into the lungs, filling alveoli. if a large proportion of both lungs are affected the patient may need additional oxygen to survive infection
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- Cambridge IGCSE Biology (Respitory System and Gaseous Exchange) Flashcards on Respiratory and Gaseous Exchang, created by Konrad O'Neill on 08/07/2013.
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- Konrad O'Neill
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