What is the main purpose of the circulatory system?

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  1. Respiration
  2. Digestion
  3. Excretion
  4. Transportation of substances

Answer (Detailed Solution Below)

Option 4 : Transportation of substances
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Detailed Solution

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The correct answer is Transportation of substances.

Key Points

  • The main purpose of the circulatory system is the transportation of substances throughout the body.
  • The circulatory system carries oxygen, nutrients, hormones, and waste products to and from cells.
    • It includes the heart, blood, and blood vessels.
  • The circulatory system is crucial for maintaining homeostasis and ensuring that tissues receive adequate oxygen and nutrients while removing waste products.
  • This system also plays a role in immune responses and temperature regulation.

Additional Information

  • The circulatory system is divided into two main parts:
    • Systemic circulation: Carries oxygenated blood from the heart to the body and returns deoxygenated blood back to the heart.
    • Pulmonary circulation: Carries deoxygenated blood from the heart to the lungs for oxygenation and back to the heart.
  • Blood consists of:
    • Red blood cells: Transport oxygen.
    • White blood cells: Fight infections.
    • Platelets: Aid in blood clotting.
    • Plasma: The liquid component that carries cells and substances.
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