Transcript File - Science with Mr. Louie

Immune System Pt 2
-There are three general cells involved with
an immune response:
-phagocytes
-B lymphocytes (B cells)
-T lymphocytes (T cells)
Phagocytes/Macrophages
-Phagocytes move through
the circulatory system
consuming waste and foreign
material, such as aged or
damaged blood cells and
some infectious bacteria
and viruses
-helps in recognizing antigens
Immune System Pt 2
B Cells
-matures in the bone marrow
-able to recognize antigens
-antibody-producing cells that are responsible for
humoral immunity (immunity by macromolecules)
-Each B-lymphocyte can give rise to only a single
type of antibody, which itself may recognize only
a single foreign antigen
Immune System Pt 2
T Cells
-matures in the thymus gland
-2 kinds: “cytotoxic” (cell killing) and “helper” Tlymphocytes.
-The cytotoxic T-cells are useful for surveillance
and elimination of intra-cellular pathogens
(Antibodies cannot reach the intracellular
pathogen because of the cell membrane, but the
infected cell can be identified and killed)
-Helper T-cells assist in organizing both the
humoral and cellular immune responses.
Immune System Analogy
Develop an analogy for your immune system. Think of war as a
scenario. Your body would be the stronghold to be defended.
As you create your analogy, be sure to include a picture and link
parts of your analogy to the things below:
Skin – first line of defense
Pathogen – the “bad guys”
Antigen – how “bad guys” are identified
Antibodies – how “bad guys” are flagged for destruction
B cells, Macrophages – the “good guys” that help identify
invaders
Helper T cells – organizers of the immune response
Killer T cells – the “good guys” that help destroy the invaders