The main reason for which we are dependent on air is our _____. 

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RRB JE CE 22 Apr 2025 Shift 1 CBT 2 Official Paper
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  1. osmoregulation
  2. excretion
  3. digestion
  4. respiration 

Answer (Detailed Solution Below)

Option 4 : 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 exchange gases with their environment.
  • Humans and most other animals require oxygen from the air for the process of cellular respiration.
  • Cellular respiration takes place in the mitochondria of cells, where oxygen is used to convert glucose into ATP (adenosine triphosphate), the energy currency of the cell.
  • During this process, carbon dioxide is produced as a waste product and must be expelled from the body.
  • The respiratory system includes structures such as the nose, trachea, lungs, and diaphragm.
  • Breathing involves the movement of air into and out of the lungs, allowing for the exchange of oxygen and carbon dioxide.
  • Maintaining proper respiration is vital for energy production, metabolic processes, and overall homeostasis in the body.

 Additional Information

  • Osmoregulation
    • Osmoregulation is the process by which organisms regulate the balance of water and electrolytes in their bodies to maintain homeostasis.
    • This process involves organs such as the kidneys in humans, which filter blood and regulate water and salt levels.
  • Excretion
    • Excretion is the process by which metabolic waste products and toxic substances are removed from the body.
    • In humans, the kidneys, liver, lungs, and skin play key roles in the excretory process.
  • Digestion
    • Digestion is the process of breaking down food into smaller molecules that can be absorbed and utilized by the body.
    • The digestive system includes organs such as the mouth, esophagus, stomach, intestines, and pancreas.

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