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Question
Explain the structure and function of human blood.
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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
- Red Blood Cells: They contain a red pigment called hemoglobin, which transports oxygen to all body cells.
- White Blood Cells: They fight against germs that enter the body. Thus, they protect the body from diseases.
- 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.
RELATED QUESTIONS
The diagram below represents the simplified pathway of the circulation of blood. Study the same and answer the questions which follow:
(i) Name the blood vessels labelled 1 and 2.
(ii) State the function of blood vessels labelled 5 and 8.
(iii) What is the importance of the blood vessel labelled 6?
(iv) Which blood vessel will contain a high amount of glucose and amino acids after a meal?
(v) Draw a diagram of the different blood cells as seen in a smear of human blood.
Given below is certain structure, write the term for the functional activity.
Erythrocytes and …………………………………
Name the following:
The kind of blood cells which can squeeze out through the walls of one category of blood vessels.
Given below is a certain structure, write its chief functional activity.
Erythrocytes - ______.
Why does the left ventricle possess a thicker wall than the right ventricle?
Put a tick mark (✓) against the correct alternative in the following statement.
The blood tastes saltish due to the dissolved.
True or false:
The four blood groups in human beings are A, B, AB and AO
Describe the functions of the: Blood
Explain the main parts of the circulatory system.
From the following identify the normal haemoglobin count in adult male.
