Blood circulation was discovered by

During an allergic reaction, the binding of antigens to IgE antibodies initiates a response, in which chemicals cause the dilation of blood vessels and a host of other physiological changes. Such chemicals are

Haemozoin is a toxic substance formed in case of malaria. It is produced by

Tetanus disease is caused by

Diphtheria is due to .............

Which of the following drug is extracted from the latex of poppy plant Papaver somniferum, generally taken by snorting and injection, is a depressant and slows down body functions?