D. LONG ANSWER TYPE
1. The principle of vaccination is to produce immunity
against a disease. Explain.
2. "Abnormally, large number of WBCs in the blood
Id are usually an indication of some infection in our
body. Comment on the statement.
.
3. Explain briefly, the role of the following health aids:
(a) Antiseptics (b) Disinfectants (c) Vaccines .
Answers
Explanation:
1 Vaccination iritides the formation of antibodies when introduced in the body of a living organism. These antibodies give the organism's ability to fight against disease.
2.Whenever there is an infection in the body, the immune system receives a signal to synthesize particular antibodies. In response to the quantity of germ-multiplication in the body, white blood cells multiply rapidly which enables it to produce more antibodies thereby stopping an infection on time. Consequently, abnormal numbers of WBCs are an indication of some infection in the body.
31)Antiseptics –
It is a mild chemical substance applied to the body to prevent growth or kill germs
Example – Iodine, Dettol etc
2)Disinfectant
These are the chemicals that kill microbes once they come in contact with them, they are too strong to be used on the body.
Example – Phenol and Cresol
3)Vaccines –
They are the substances that are administered in the body to provide passive immunity. These are the materials that are germs or secreted by germs.
Example – DTP, OPV