Why a human body needs so many types of cells in immune system of body?
The adaptive immune system is much slower to get going, but once it does, it’s highly specific in its action & tends to be very successful. These cells analyse the pathogen and then produce immunoglobulins – antibodies tailored to deal with that one type of pathogen. Adaptive immune cells carry a memory of every pathogen they’ve ever encountered, which means that they’ll be far quicker at reacting should they meet the same one a second time. The major cells in this system are B & T lymphocytes.
