Lymphatic System

Lymphatic/Immune System
Structures: White Blood Cells, thymus, spleen, lymph nodes, lymph vessels
Function: Helps protect the body from disease, helps collect the fluid lost from blood vessels and returns the fluid to the circulatory system
Pathogen- Disease Causing Agent
Vector- animal that carries pathogens from person to person
Bacteria- domain of unicellular prokaryotes that have cell walls containing peptidoglycan
Virus- particle made up of nucleic acid, protein, and in some cases lipids that can replicate only by infecting living cells
Capsid- outer protein coat of a virus
Antibody- protein that helps destroy pathogens
Antibiotic- compound that blocks the growth and reproduction of bacteria
Vaccine- a preparation of weakened of killed pathogens
Helper T Cells- produce memory T cells
Killer T Cells- track down an destroy the bacteria, fungi, protozoan or foreign tissue that contains the antigen

Name three ways pathogens are prevented from entering the body.
Three ways pathogens are prevented from entering the body is
Describe how Antibiotics work.
Antibiotics work by interfering with the cellular processes of microorganisms.
How do vaccines work?
A vaccine is a weakened form of a pathogen to produce immunity. The type of immunity produced by the body’s reaction to a vaccine is known as active immunity. Active immunity appears after exposure to an antigen or a vaccination.

Describe the roles of helper T cells and killer T cells.
During cell mediated immunity, T cells divide and differentiate into killer T cells and helper T cells. The killer T cells track down and destroy the bacteria, fungi, protozoan or foreign tissue that contains the antigen while the helper T cells produce memory T cells.