B Cell Response (Edexcel A (SNAB) A Level Biology)

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B Cell Response

  • B cells, also known as B lymphocytes, are a second type of white blood cell in the specific immune response
    • B cells remain in the bone marrow as they mature, hence the B in their name
  • B cells have many specific receptors on their cell surface membrane
    • The receptors are in fact antibodies, and are known as antibody receptors
    • Each B cell has a different type of antibody receptor, meaning that each B cell can bind to a different type of antigen

The maturation of B lymphocytes

Mature B cells each have different types of antibody receptors on their cell surface membrane

  • If the corresponding antigen enters the body, B cells with the correct cell surface antibodies will be able to recognise it and bind to it 
    • When the B cell binds to an antigen it forms an antigen-antibody complex
  • The binding of the B cell to its specific antigen, along with the cell signalling molecules produced by T helper cells, activates the B cell
  • Once activated the B cells divide repeatedly by mitosis, producing many clones of the original activated B cell
  • The daughter cells differentiate into two main types of cells
    • Effector cells, which go on to form plasma cells
      • Plasma cells produce specific antibodies to combat non-self antigens
    • Memory cells
      • Remain in the blood to allow a faster immune response to the same pathogen in the future

The function of B-lymphocytes during a primary immune response_1

During a primary immune response B cells divide by mitosis to form plasma cells and memory cells. Note that a primary response occurs the first time an individual comes into contact with a particular pathogen

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Marlene

Author: Marlene

Expertise: Biology

Marlene graduated from Stellenbosch University, South Africa, in 2002 with a degree in Biodiversity and Ecology. After completing a PGCE (Postgraduate certificate in education) in 2003 she taught high school Biology for over 10 years at various schools across South Africa before returning to Stellenbosch University in 2014 to obtain an Honours degree in Biological Sciences. With over 16 years of teaching experience, of which the past 3 years were spent teaching IGCSE and A level Biology, Marlene is passionate about Biology and making it more approachable to her students.