A) constriction of peripheral blood vessel
B) blood capillaries become highly permeable causing loss of fluid from the blood
C) drastic increase in the blood pressure
D) All of the above
Correct Answer: B
Solution :
Anaphylactic shock is severe form of allergy, which is caused by an antigen of poisonous nature like insect bite, injection of penicillin to a penicillin sensitive person, or by certain allergic food. Histamine released from ruptured mast cells and basophils causes marked dialation of all arteries through out the body and blood capillaries become highly permeable causing loss of large amount of fluid from blood to the tissue which in turn cause drastic fall in blood pressure. If immediately person is not injecting epinephrine, it leads to death.
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