The process of acquiring oxygen from outside the body, and to use it in the process of break-down of food sources for cellular needs is called ______. 

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  1. digestion 
  2. respiration 
  3. ingestion 
  4. reproduction

Answer (Detailed Solution Below)

Option 2 : respiration 
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Detailed Solution

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The correct answer is respiration.

Key Points

  • Respiration is the process by which organisms take in oxygen from the environment and release carbon dioxide as a byproduct.
  • It involves the breakdown of glucose to produce energy, which is essential for cellular activities.
  • Respiration occurs in two main stages: external respiration (breathing) and internal (cellular) respiration.
  • Cellular respiration occurs in the mitochondria of cells where oxygen is used to produce ATP, the energy currency of the cell.

Additional Information

  • External Respiration: This involves the exchange of gases between the atmosphere and the blood through the lungs.
  • Internal Respiration: This refers to the exchange of gases between the blood and the body cells.
  • Aerobic Respiration: A type of respiration that requires oxygen to produce ATP, occurring in the mitochondria.
  • Anaerobic Respiration: A form of respiration that occurs without oxygen, resulting in less energy production and the production of lactic acid or alcohol as byproducts.
  • ATP (Adenosine Triphosphate): The primary energy carrier in cells, produced during cellular respiration.
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