Respiration & Homeostasis

Topics: Carbon dioxide, Oxygen, Gas Pages: 2 (374 words) Published: December 2, 2012
* The release of energy from food
* All living cells need energy to carry out M R S G R E N, contraction of muscles, build up of larger molecules (e.g. proteins), maintains steady body temperature (homeostasis) * Aerobic:
* needs oxygen
* only occurs when a certain amount of oxygen is available * C6H12O6 + 6O2 6CO2 + 6H2O + Energy
* releases large amount of energy (2900 KJ)
* Anaerobic:
* without oxygen
* [glucose lactic acid] C6H12O6 2C3H6O3
* releases small amount of energy (120 KJ)
* poisonous waste (lactic acid) removed to produce joined with O2, H2O + CO2

* Inhalation: taking air in lungs
* muscles contract – diaphragm, intercostal muscles
* volume increases
* outside of lungs: high atmospheric pressure; inside lungs: low pressure * air flows into the lungs because of the difference in pressure * Inhalation: taking air out of lungs
* muscles relax – diaphragm, intercostal muscles
contract – internal intercostal muscles
* volume decreases
* outside of lungs: low pressure; inside lungs: high pressure * air flows out of the lungs because of the difference in pressure * GASES EXCHANGED INHALED EXHALED * Carbon Dioxide: 0.04% 4% * Nitrogen: 79% 79% * Oxygen: 21% 16% * Water: Variable High * Temperature: Variable High * Alveoli are the site of gas exchange. Adaptations:

* large surface area
* good supply of oxygen and blood (surrounded by capillaries) for rapid diffusion of gas * thin walls
* moist lining for dissolving gases


* the maintenance of a constant internal environment in the...
Continue Reading

Please join StudyMode to read the full document

You May Also Find These Documents Helpful

  • Essay about Homeostasis Lab
  • Respiration Paper
  • Unit 5 P5- Explain the Concept Homeostasis with Reference to the Control of Heart Rate, Breathing Rate, Body Temperature and Blood Glucose....
  • Homeostasis Research Paper
  • Homeostasis Essay
  • Science respiration Essay
  • Essay on Homeostasis in the Lungs
  • Essay on Cellular Respiration

Become a StudyMode Member

Sign Up - It's Free