Page 30 - SAAT BIOLOGY PART 2

SAAT BIOLOGY MR.MOHAMED ELGAYAR MRPROF.NET

• Lymphatic organs: lymph nodes, tonsils, spleen, thymus

gland.

• Lymph nodes: filters the lymph and removes foreign

material from the lymph.

• Tonsils: forms a protective ring of lymphatic tissue

between the nasal and oral cavities.

• Lymphocytes: are a type of white blood cells that is

produced in red bone narrow, which has two types B cells

and T cells.

• B-lymphocytes (B cells): can be thought of as antibody

factories.

• Cytotoxic T cells (T killer cells): destroy pathogens T

helper cells: activates B

• AIDS: is a result of the HIV virus infecting T helper cells.

• Passive immunity: occurs when antibodies are made by

other people or animals and are transferred or injected

into the body. For example: Antibodies produced by the

MRPROF.NET MR.MOHAMED ELGAYAR MRPROF.NET@GMAIL.COM