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Question
Explain with reasons.
Human blood is red coloured.
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Solution
Blood is red because it is composed of red cells known as red blood cells. Hemoglobin is a protein found within red blood cells. Each hemoglobin protein is composed of subunits known as hemes, which are responsible for the red colour of blood. Hemes, in particular, can bind iron molecules, and these iron molecules bind oxygen. Because of the interaction between iron and oxygen, blood cells are red. When iron is oxygenated, it turns red, and blood turns red as a result.
RELATED QUESTIONS
Given below is a diagram of a human blood smear.
Study the diagram and answer the questions that follow:
a) Name the components numbered ‘1’ to ‘4’
b) Mention two structural differences between the parts ‘1’ and ‘2’.
c) Name the soluble protein found in part ‘4’ which forms insoluble threads during clotting of blood.
d) What is the average lifespan of the component numbered ‘1’ ?
e) Component numbered ‘1’ do not have certain organelles but are very efficient in their function. Explain
Given alongside is a diagram of human heart showing its internal structures. Label the parts marked 1 to 6, and answer the following questions.
- Which type of blood is carried by the blood vessel marked 2?
- Name the main artery which takes the blood from heart to different parts of the body?
- Which chamber of the heart receives deoxygenated blood from the body?
Is it true that your heart beats more than one lac times per day?
Name the following:
The artery which carries deoxygenated blood.
Note the relationship between the first two words and suggest a suitable word/words for the fourth place:
Coronary artery : Heart :: Hepatic artery : ______
Find out my partner.
| Group 'A' | Group 'B' |
| 1. Heart beats | a. 350 ml |
| 2. RBC | b. 7.4 |
| 3. WBC | c. 37∘C |
| 4. Blood donation | d. 72 |
| 5. Normal body Temperature | e. 50-60 lakh/mm3 |
| 6. pH of oxygenated blood | f. 5000-6000 per mm3 |
Multiple choice questions. Tick ( ✓ ) the correct choice:
The blood vessels in which blood goes away from the heart to different body parts are
Long answer question:
Describe human blood and give its functions.
Which of the following correctly represents the components of blood?
Assertion (A): RBCs help in the transport of respiratory gases.
Reason (R): The cytoplasm of RBCs contains the respiratory pigment Haemoglobin.
