These are known for their effects on cardiovascular system

Lymph nodes are secondary lymphoid organs. Explain the role of lymph nodes in our immune response.

Assertion : Cocaine has a potent stimulating action on central nervous system, producing a sense of euphoria and increased energy.

Reason : Injecting the microbes intentionally during immunisation or infectious organisms gaining access into body during natural infection induces active immunity.

Write a note on Morphine and Codeine.

Cocaine is obtained from

Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?