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Answer the Follwing Question in Your Own Words. - SSC (English Medium) Class 8 - Science

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Question

Answer the follwing question in your own words.

Explain the structure and function of human blood.

Solution

Blood is a fluid connective tissue that flows in blood vessels. It is composed of two components- plasma and blood cells. 

Plasma is a yellowish colour fluid, made up of water (~90%) and some dissolved nutrients, proteins, hormones and waste products. 

Blood consists of three types of blood cells. These are

i. Red Blood Cells: They contain a red pigment called haemoglobin, which transports oxygen to all body cells.

ii. White Blood Cells: They fight against germs that enter the body. Thus, they protect the body from diseases.

iii. Platelets: When we get injured, bleeding stops after some time. This happens because of the activity of platelets, which help in the clotting of blood.

Functions of blood:

  • It transports nutrients and oxygen to the different parts of the body.

  • It also carries waste materials (from the different parts of the body) to be removed by the excretory organs.

  • Chemical messengers like hormones are transported by the blood.

  • Protects the body from disease carrying germs.

  • Helps to maintain a constant body temperature.
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APPEARS IN

 Balbharati Solution for Balbharati Class 8 Science - General Science (2018 to Current)
Chapter 11: Human Body and Organ System
Exercise | Q: 5.2 | Page no. 82
Solution Answer the Follwing Question in Your Own Words. Concept: Blood Circulatory System.
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