aim: how does our immune system protect against antigens of pathogenic organisms? hw 22 read ch 40...
TRANSCRIPT
Aim: How does our immune system protect against antigens of pathogenic organisms?
HW 22
Read Ch 40 pages 1028 – 1048
Pg 1034 vocabulary
Pg 1050 Thinking visually
copy and complete concept map.
The human immune system is made up of…
• Lymphatic vessels• lymph nodes• lymphoid tissue
– bone marrow, thymus, tonsils, adenoids, Peyer's patches, and the appendix
Cellular barriers to infection
• Neutrophils – Polymorphonuclear cells are recruited to the site of infection where they phagocytose invading organisms and kill them intracellularly
Cellular barriers to infection
• Macrophages – Tissue macrophages function in phagocytosis and intracellular killing of microorganisms.
Cellular barriers to infection
• Eosinophils
have proteins in granules that are effective in killing certain parasites
How do Lymphocytes Produce Antibodies?
Antibodies are..
Molecules in the blood or secretory fluids that tag, destroy, or neutralize bacteria, viruses, or other harmful toxins
Antibodies are chemicals that have antigen binding sites
Antigens are proteins on the foreign body (pathogens).
AntibodyAntigen
Antigen-binding sites
Bacteria With Antigens on Surface
Macrophage
T cell
B cell
Active B cells
T cell
Section 40-2
Humoral immunity is the body’s immune response
Plasma cell
Bacteria With Antigens on Surface
Macrophage
T cell
B cell
phagocyte called a macrophage engulfs a bacterium
Active B cells proliferate to produce clones of memory cells
T cell, activated by macrophage, becomes a helper T cell
Antigens are displayed on surface of macrophage after digestion of bacterium
T cell binds to activated macrophage
Section 40-2 Humoral ImmunityBacterial antigens also stimulate B cells
Plasma cell produces large amounts of antibody proteins, released intothe bloodstream