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प्रश्न
Explain with reasons.
Human blood is red coloured.
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उत्तर
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.
संबंधित प्रश्न
Explain with tile help of a chart, explain the compatibility of human blood groups.
With which human organ system (or human systems) is the vena cava associated?
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?
Describe the circulatory system of humans.
Given below is certain structure, write the term for the functional activity.
Erythrocytes and …………………………………
The nearest organ to which the heart supplies oxygenated blood is:
Name the following:
The artery which carries deoxygenated blood.
Veins have valves at intervals in their inner lining whereas the arteries do not have valves. Explain.
Name the systems that carry out the different functions of the body.
Why do we call saliva a digestive juice?
