Question

A boy hurt his elbow a little. A few drops of blood came out. He washed the wound with clean water.

A little later he found the blood has stopped but a reddish black thing has formed on it.

Pick up the CORRECT statement.

A. This thing is formed to prevent the loss of blood.

B. This thing protects the underlying skin.

C. Vitamin K helps in its formation.

D. All of these are correct.

Answer 1

Required Answer:-

All the correct statements here.

- All of these are correct (D)✓

• The blood stopped and a small clot was formed to prevent the loss of excess blood.
• This happens because of the blood component known as platelets (or thrombocytes)$.$
• Vit. K is a necessary nutrient for the formation of blood clot. Hence, we should consume adequate amount of food rich in this vitamin.
• The entire mechanism is explained in the attachment.
• Platelets secretes prothombinase which converts prothrombin to thrombin. In the presence of thrombin, fibrinogen gets converted to fibrin. Fibrin and other platelets helps in the formation of clot.