Question

One of the inflammatory reaction induced by the histamine is
(A) Vasoconstriction of blood vessels
(B) Vasodilation of peripheral blood vessels
(C) Decreased vascular permeability
(D) Accelerated blood clotting

Answer 1

Hint: Histamine is the nitrogenous compound that is produced in the body. These organic substances are involved in the production of the inflammatory or the allergic response in the body when there is the wound. They are called the mediator of inching.

Complete Answer:
- When there is the damage of any body tissues, histamine causes the vasodilation of the peripheral blood vessels.
- Due to which there will be an increased flow of the blood at the point of the inflammation. This also releases many chemicals by mediating the inflammatory responses and causes the redness, pain, swelling in the affected areas.
- They also help in the immune response when the foreign pathogens enter into the host body. These compounds are synthesized by the basophils and the mast cells of the white blood cells.
- The mast cells are located mainly in the areas of the nose, mouth, feet, blood vessels etc. This substance helps to maintain the permeability in the blood capillaries to the WBC and the other proteins to act on the pathogens in the infected tissues.

Thus the option (B) is correct.

Note: The histamine causes the reduction of the blood pressure by the vasodilation. They are also projected out into the hypothalamus and hence it helps in regulating the sleep and the wake mechanisms. This helps in the release of the acid from the layer of the stomach for the purpose of the digestion.