Human Circulatory System – Class 11 | Chapter – 18 | Biology Short Notes Series PDF

Human Circulatory System: The human circulatory system consists of a network of arteries, veins, and capillaries, with the heart pumping blood through it. Its primary role is to provide essential nutrients, minerals, and hormones to various parts of the body. Alternatively, the circulatory system is also responsible for collecting metabolic waste and toxins from the cells and tissues to be purified or expelled from the body.

Features of Human Circulatory System

The crucial features of the human circulatory system are as follows:

  • The circulatory system consists of blood, heart, blood vessels, and lymph.
  • The circulatory system circulates blood through two loops (double circulation) – One for oxygenated blood, another for deoxygenated blood.
  • The human heart consists of four chambers – two ventricles and two auricles.
  • The circulatory system possesses a body-wide network of blood vessels. These comprise arteries, veins, and capillaries.
  • The primary function of blood vessels is to transport oxygenated blood and nutrients to all parts of the body. It is also tasked with collecting metabolic wastes to be expelled from the body.
  • Most circulatory system diagrams do not visually represent its sheer length. Theoretically, if the veins, arteries, and capillaries of a human were laid out, end to end, it would span a total distance of 1,00,000 kilometres (or roughly eight times the diameter of the Earth).

Organs of Human Circulatory System

The circulatory system comprises 4 main organs that have specific roles and functions. The vital circulatory system organs include:

  • Heart
  • Blood (technically, blood is considered a tissue and not an organ)
  • Blood Vessels
  • Lymphatic system

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