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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
Why is blood needed by all the parts of a body?
Name the following:
The blood vessels which start from capillaries and end in capillaries.
The table below is designed to indicate the transport of certain substance in our body. Fill in the
blanks with suitable answers.
| Substance | From | To |
| Lungs | Whole body | |
| Carbon dioxide | ||
| Urea | ||
| Digested carbohydrates |
Intestines | |
| Target organs |
How do you account for the following difference?
The left ventricle has thicker walls than the right ventricle.
Give reason for the following:
The arteries are deep seated in the body
Given below is a highly schematic diagram of the human blood circulatory system.
Which numbers represent the following respectively?
Aorta
Hepatic portal vein
Pulmonary artery
Superior vena cava
Renal vein
Stomach
Describe the functions of the: Blood
Differentiate between:
Red blood cells and White blood cells
Differentiate between:
Open circulatory system and Closed circulatory system.
Hematocrit is ______.
