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Human blood is a connective tissue composed of a fluid, plasma and blood corpuscles. It is a circulating fluid, which not only provides body organs with nutrients and oxygen, but also removes waste from them.

The volume of blood in an adult person of 70 kg weight is approximately 5.5 litres . It is a slightly alkaline fluid having pH 7.4. pH of blood in arteries is more than in veins.

This course covers human blood, blood cells, and blood disorders.

Functions of Human Blood

Blood has many vital functions, such as the following:

  • transporting oxygen and nutrients to the lungs and tissues
  • forming blood clots to prevent excess blood loss
  • carrying cells and antibodies that fight infection
  • bringing waste products to the kidneys and liver, which filter and clean the blood
  • regulating body temperature
  • maintaining fluid balance

Blood is considered a connective tissue for two basic reasons. Just as other connective tissues, it originates from the mesodermal layer of the embryo .

Moreover, blood connects the body systems together as it brings  oxygen and nutrients to organs while removing wastes from them.

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