Explain what is meant by metastasis.
The non-regulated growth of the cells that accompanies cellular transformation produces tumours or neoplasms. Each tumour being the product of proliferation of a single abnormal cell. Malignant tumour cells are cancer cells that spread to mid take up residence in neighbouring tissues – a condition called metastasis.
What are the various public health measures, which you would suggest as safeguard against infectious diseases?
What is the mechanism by which the AIDS virus causes deficiency of immune system of the infected person?
What are the various routes by which trans-mission of human immunodeficiency virus takes place?
In your view what motivates youngsters to take to alcohol or drugs and how can this be avoided?
The following are some well-known abbreviations, which have been used in this chapter. Expand each one to its fall form:
(a)MALT (b) CMI
(c)AIDS (d)NACO
(e)HIV
Discuss with your teacher what does ‘a suitable gene' means, in the context of DNA vaccines.
Why is that once a person starts taking alcohol or drugs, it is difficult to get rid of this habit? Discuss it with your teacher.
Hovy does the transmission of each of the following diseases take place?
(a)Amoebiasis (b) Malaria
(c)Ascariasis (d) Pneumonia
Differentiate the following and give examples of each
(a)Innate and acquired immunity
(b)Active and passive immunity
Do you think that friends can influence one to take alcohol/drugs? If yes, how may one protect himself/herself from such an influence?