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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
Name the following:
The smallest common blood vessels formed by the union of capillaries.
Name the following:
The blood vessels which start from capillaries and end in capillaries.
Differentiate between members of the following pairs with reference to the aspect asked within bracket:
artery and vein (type of blood primarily flowing through)
Give reason for the following:
The blood groups of both the donor and recipient must be known before transfusing blood.
The oxygen-rich blood from the lungs comes into the ______ of the heart.
Differentiate between:
Red blood cells (RBC) and White blood cells (WBC)
Given below is a schematic representation of the circulatory system in man. Study the same and answer the questions that follow:
(i) Label the parts 1 to 4 indicated in the diagram.
(ii) Give one difference between parts 1 and 2 based on:
(a) their structure
(b) the nature of blood flowing through them.
(iii) What is the specific name of the type of blood circulation that takes place between the heart and the lungs?
(iv) Name the valve found at the beginning of the part labeled 3.
Complete the following sentence with appropriate word:
The membranous covering of the heart is _______.
State the Location:
Tonsils
The stomach is like a ______.
