A student on a school trip started sneezing and wheezing soon after reaching the hill station for no explained reasons. But, on return to the plains, the symptoms disappeared. What is such a response called? How does the body produce it?
The response is called allergy. Allergy is an exaggerated response of the immune system to certain antigens (allergens) present in the environment. It is due to production of IgE type antibodies against allergens and the release of chemicals like histamine and serotonin from mast cells.
A team of students are preparing to participate in the interschool sports meet. During a practice session you find some vials with labels of certain cannabinoids.
(a) Will you report to the authorities? Why?
(b) Name of a plant from which such chemicals are obtained.
(c) Write the effect of these chemicals on human body.
Why sharing of injection a needle between two individuals is not recommended?
Indiscriminate diagnostic practices using X-rays etc., should be avoided. Give one reason.
Name any two types of cells that act as 'cellular barriers' to provide innate immunity in humans.
