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The main active constituent of tea coffee is
1. nicotine
2. chlorophyll
3. caffeine
4. aspirin

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Correct Answer - Option 3 : caffeine

The correct answer is caffeine.

Caffeine is the main active constituent of tea and coffee.

  • Caffeine works by stimulating the central nervous system (CNS), heart, muscles, and the centres that control blood pressure.
    • Caffeine can raise blood pressure, but might not have this effect on people who use it all the time.
    • Caffeine can also act like a “water pill” that increases urine flow.
  • Nicotine works by stimulating our nervous system to release specific chemical messengers (hormones and neurotransmitters) that affect different parts of our brain and body.
    • One hormone that nicotine affects is epinephrine, also known as adrenaline.
  • Chlorophyll is a green pigment found in plants.
    • Plants use chlorophyll and light to make food.
    • People sometimes use chlorophyll as medicine.
    • Common sources of chlorophyll used for medicine include alfalfa, algae, and silkworm droppings.

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