Which molecules are involved in mediating local vasodilation and vasoconstrictio

Question

Which molecules are involved in mediating local vasodilation and vasoconstriction at sites of injury? Prostaglandins IL-1 Complement H_2O_2 Lysozymes Which of the following cells are directly involved in seeking out and destroying cancerous cells without the aid of the entire immune system? N_k cells CTL T_1H T_2H Plasma Cell Which of the following cells are directly involved in stimulating the above mentioned cells? N_k cells CTL T_1H T_2H Plasma Cell Which of the following cells are directly involved in seeking out and destroying infective cells with the aid of the entire immune system? N_k cells CTL T_1H T_2H Plasma Cell

Explanation / Answer

15.

Prostaglandins are effective local vasodilators. They inhibit the aggregation of blood platelets and are also involved in inflammation.

So, option A is correct.

Complements induce the release of histamine from mast cells which can also promote vasodilatation. It is an indirect effect.

16.

NK cells are directly involved in seeking out and destroying cancerous cells without the aid of the entire immune system.

NK cells are effector lymphocytes of the innate immune system that destroy several types of cancer cells.

So, option A is correct.

17.

NK cells are activated by secretions from cytotoxic T-cells (CTL).

So, option B is correct.

18.

Plasma cells produce antibodies which require the entire immune system for its secretions and pathogen clearance.

So, option E is correct.

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