How would a vaccine prevent someone getting an infection?
Vaccines are made of dead or inactive pathogens. White blood cells in the body come into contact with the pathogen and produce antibodies which destroy the pathogen. The body produces memory cells which means when it is reinfected by the pathogen, it can quickly produce antibodies to destroy the pathogen before symptoms develop.
ND
Related Biology GCSE answers
All answers ▸What are the differences between the nervous and endocrine systems in maintaining homeostasis?
How does the body control blood sugar?
"Hormones are secreted by endocrine glands." Explain the meaning of this statement.
Amylase is the enzyme that controls the breakdown of starch to glucose. Describe how the student could investigate the effect of pH on the breakdown of starch by amylase.