Blood Composition and Functions – Class 11 | Chapter – 18 | Biology Short Notes Series PDF

Blood Composition and Functions: Blood is a red colour pigment that circulates in the body. It contains plasma, red blood cells, white blood cells, and platelets. It performs various functions in the body. Let us study in detail about the composition and function of blood, its components, blood transfusion, blood pressure, and blood group.

Blood Composition and Functions

Composition of Blood

Its pH value is nearly 7.4, so it is considered base in nature.

Blood is a connective tissue that helps in the transportation of substances, protects against diseases and regulates the temperature of the body.

It is red in colour due to a red pigment called haemoglobin present in its red cells. The components of Blood are Plasma, Red blood corpuscles (Red blood cells or RBCs), White blood corpuscles (White blood cells or WBCs) and platelets.,

Functions of Blood

Blood has three main functions in the human body i.e Transport of substances from one part of the body to the other like respiratory gases, waste products, enzymes, etc, protection against diseases and regulation of body temperature.

  • Blood regulates body temperature.
  • It carries oxygen from lungs to different parts of the body.
  • It carries carbon dioxide from the body cells to the lungs for breathing out.
  • It carries digested food from the small intestine to all parts of the body.
  • It carries hormones from the endocrine glands to different organs of the body.
  • It carries waste product urea from the liver to the kidneys for excretion.
  • Defends against infection.

On average, a healthy man has about 5 litres of blood in the body, while a woman has about 500 ml less than man. So, total blood is about 60-80 ml/kg of body weight.

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