The volume of blood present in an adult human is
A) 10 litres
B) 5 litres
C) 2 litres
D) 1 litre

Hint:Blood is a fluid connective tissue which is red in colour and functions as a medium to transport necessary substances like oxygen and nutrients to the cells.

Complete answer:
Before we find the correct answer, let us first know the various components of blood. The various components of blood are,
>Plasma - It is a viscous fluid which is straw coloured and fluid part of the blood. It constitutes 55% of the blood.
>Erythrocytes or Red blood cells - They are involved in transportation of oxygen to various parts of the body
>Leukocytes or White blood cells - They help in providing defense against microbes and foriegn bodies
Platelets - They have a role in clotting of blood

>Option A, C and D: As, the volume of blood present in the human body is 5 litres. Therefore, this is the incorrect option.
>Option B: In the human body, the amount of blood present is 5 litres. Therefore, this is the correct option.

The solid part of the blood consists of red blood cells or erythrocytes, white blood cells or leukocytes and platelets, whereas, the liquid part of the blood is known as plasma.

Thus, the correct answer is option (B) 5 litres.

Note: The various functions of blood are,
>They provide oxygen to the cells by absorbing oxygen from lungs and transporting it to different parts of the body.
>They help in transport of hormones from endocrine glands to various organs and tissues.
>It helps in maintenance of internal body temperature either by absorbing heat or by releasing heat.
>The platelets present in blood help in clotting of blood in case of injury.