GOOD

1. 1
IMMUNITY
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This can be inborn immunity or adopted
Immunity can be broadly divided into two types
1. Natural immunity.
2. Artificial immunity.
Then the two can be sub-divided into following:
active natural
passive natural
active artificial
passive artificial
as describe in the diagrams in next slides.

2. 2

3. 3

4. 4
1.Specific immunity: antibodies invade specific
organisms. e.g. BCG for T.B only
2.Non-specific immunity : antibodies attack any
kind of organism without discrimination.
This is done by phagocytosis
• Where the T-lymphocytes which develop in the
thymus gland attack microrganisms.
• B-lymphocytes which develop in the bone
marrow.
• Or Phagocytes which are microphages digest
invading organisms.
Immunity can also be described as;

5. B cell and T cell are specific for a particular
antigen.
Each is able to bind to a particular molecular
structure or receptor, i.e;
• The B cell receptor (BCR) and
• The T cell receptor (TCR) respectively.
T stands for thymus where the T lymphocytes
mature,
B stands for bone marrow where B lymphocytes
B-AND T-LYMPHOCYTES
mature. 45

6. 6
Cont..
Types of T-lymphocyttes
1. helper T cell
2. natural killer T cell
3. suppressor T cell
4. cytotoxic T cell
5. memory T cell
6. regulatory T cell
7. gamma delta T cell