A wound stops bleeding due to the process of clot formation called coagulation. When a mosquito makes a cut on our skin to suck blood, blood doesn't clot. What is the reason for this phenomenon?

Blood is directly taken in from human body to mosquitos mouth without exposure to air

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Blood clots primarily and is then again liquefied by mosquito

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Mosquito's saliva has an anticoagulant which doesn't allow blood to clot

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All of the above

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Solution

The correct option is D Mosquito's saliva has an anticoagulant which doesn't allow blood to clot
The female mosquitos are hematophagous in nature.
Their salivary glands have thrombin-directed anticoagulants which prevent the blood from clotting.
They inject their saliva into the human body before they start sucking their blood to prevent any clotting.
So, the correct answer is 'Mosquito's saliva has an anticoagulant which doesn't allow blood to clot'.

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The clotting factor in plasma is fibrinogen but we do not have clots in our blood vessels as we have a natural anticoagulant called:

Appu’s injury stopped bleeding within minutes and a black scab was beginning to form. “Ewww...” exclaimed Appu, though he was relieved to see the bleeding stop. The doctor further explained that “Blood forms a clot to begin the process of healing. Some components block the leakage of blood and close the body from the outside world. This is the clot and the process of rebuilding the skin starts as soon as it is formed.”

Which component of blood is the doctor referring to?

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