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Circulation is the process of transporting oxygen, nutrients, hormones, and other essential substances throughout the body. The circulatory system also helps remove waste products such as carbon dioxide from body tissues.

This chapter is highly important for NEET and Class 12 Board Exams.

Human Circulatory System

The circulatory system consists of:

  • Heart
  • Blood
  • Blood Vessels

These components work together to ensure the continuous flow of blood throughout the body.

Blood

Blood is a connective tissue that transports oxygen, nutrients, hormones, and waste materials.

Components of Blood

  • Plasma
  • Red Blood Cells (RBCs)
  • White Blood Cells (WBCs)
  • Platelets

Each component performs a specific function in maintaining health.

Circulation
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Heart

The heart is a muscular organ that pumps blood to all parts of the body.

Functions of the Heart

  • Pumps oxygenated blood to tissues.
  • Receives deoxygenated blood from the body.
  • Maintains continuous blood circulation.

Blood Vessels

Arteries

Carry blood away from the heart.

Veins

Carry blood towards the heart.

Capillaries

Facilitate the exchange of gases, nutrients, and waste materials between blood and tissues.

Double Circulation

Humans exhibit double circulation, where blood passes through the heart twice during one complete cycle. This ensures efficient oxygen supply to body tissues.

Importance of Circulation

  • Transports oxygen and nutrients.
  • Removes metabolic wastes.
  • Maintains body temperature.
  • Distributes hormones.
  • Supports overall body functions.

Importance for NEET

Circulation is a high-weightage chapter in Biology. Questions are frequently asked on heart structure, blood components, blood vessels, cardiac cycle, blood groups, and double circulation.

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