Acquired Immunity

Biology

definition

Passive acquired immunity

  • Immunity is provided from an outside source in the form of ready made antibodies.
  • It can be of two types naturally acquired and artificially acquired passive immunity.
  • Naturally acquired passive immunity is the readymade or the prepared mother's antibodies.
  • Artificially acquired passive immunity is the introduction of ready made antibodies having been produced in other animals. 

definition

Acquired immunity

  • Acquired immunity is a resistance to a disease which an individual acquires during his lifetime.
  • Acquired immunity can be actively acquired, which is produced in one's own body.
  • Passively acquired immunity can be either natural or artificial.

definition

Humoral immunity

  • It consists of antibodies that circulate in the body fluids like blood plasma and lymph.
  • It consists of plasma B cells and memory B cells.
  • Humoral immunity protects the body from viruses, some bacteria and toxins that enter the body fluids like blood and lymph.

definition

Cell mediated immunity

  • Cell mediated immunity protects the body against viruses, fungi and some bacteria which have entered the host's cells. 
  • It reacts against tissue transplants and also against the body's own cells which become cancerous.
Types of T cells:
  • Helper T cells
  • Cytotoxic T cells
  • Memory T cells
  • Suppressor cells

definition

Third line of defense

  • The immunity that an individual acquires after the birth is called acquired immunity or adaptive immunity. 
  • It is specific and mediated by antibodies or lymphocytes or both which make the antigen harmless.

definition

Cell-mediated reponse

definition

Antibody-mediated immunity