Question

The volume of blood present in an adult human body is:
A)10 Litres
B)5 Litres
C)2 Litres
D)1 Litres

Answer 1

Blood is a type of fluidic connective tissue present in the human and other animals. It consists of different types of cells like RBC, WBC, platelets, etc. It helps in the transportation of nutrients to all the cells.

Complete answer:
In multicellular organisms like us, it is very important to transport necessary nutrients and waste from one place to another. So, we need a transporter which can take different materials from one part of the body to another part of the body.

Animals consist of a fluidic material called as blood which helps in transportation of not only nutrients but of minerals, proteins, hormones and waste. It transports oxygenated blood which carries oxygen in it so that cellular metabolic processes can take place normally.
In vertebrates, blood is a mixture of blood cells and fluid known as blood plasma. Plasma is 55% of blood fluid and it contains water which is 92% by volume. Except water plasma contains proteins, lipids, ions, hormones, glucose, etc. Albumin is the main protein of the plasma.

Human adult body having a weight of 150-180 pounds should have about 1.2 – 1.5 gallons of blood which is approximately 4,500 to 5,700 mL.

Hence, the correct answer is option (B)

Note: RBC – Red Blood Corpuscles or erythrocytes; WBC – White Blood Corpuscles or leukocytes; Platelets are also known as thrombocytes. RBCs are deprived of nucleus and other cellular organelles so that they can transport oxygen efficiently and do not utilize oxygen for their cellular activities.