29 terms

Bacteria/immune system

STUDY
PLAY

Terms in this set (...)

Immune System
Human body system that recognizes (sees), marks and destroys pathogens
Pathogen
Anything that can cause disease (make you sick). Bacteria, parasites, fungi, protists and viruses are examples.
Bacteria
Living, single celled organism that causes disease. Can be killed by antibiotics.
Antibiotic
A medicine that kills bacteria and other living cells. DOES NOT KILL VIRUSES!
Virus
DNA surrounded by protein - causes disease. Cannot be killed by antibiotics.
Fungi
Fungus cells like mushrooms or mold, many can infect and make you ill
White Blood Cell
Immune system cell that makes antibodies and destroys pathogens and infected cells by engulfing (eating) them
Antibody
Proteins made by the immune system to identify pathogens, stick to the antigens on pathogen cells.
allergy
abnormally sensitive reaction to an antigen
Vaccine
A version of dead or weak pathogens is put in the person's body so the immune system learns to recognize the pathogen and can make antibodies.
Inflammation
nonspecific defense against infection, characterized by redness, heat, swelling, and pain. Also known as the second line of defense.
First line of defense
Nonspecific barriers that prevent pathogens (germs) from entering cells, including skin, mucus, saliva, and stomach acid.
T-Cell
a lymphocyte that identifies pathogens in cells to destroy the cell.
Saliva, Mucus and Tears
flushes out germs, contains enzymes that breakdown cell walls of germs and bacteria, first line of defense
Lymph Nodes
filters lymph (extra fluid from tissues) to remove germs and pathogens
Antigen
A protein attached to pathogens that triggers the production of an antibody
Skin
first line of defense, largest organ, germ-proof and waterproof, has oil (sebum) on the outside to help keep out germs
leukocyte
white blood cell; protects the body from harmful invading substances
B-Cell
Lymphocytes that mature in bone marrow and make antibodies in response to antigens
capsule
layer of sugars outside the cell wall
plasma membrane
phospholipid bilayer regulates what enter and leaves
pilli
hair like appendages on the surface of many bacteria
obligate anaerobe
cannot live in presence of oxygen
obligate aerobe
need oxygen to live
chemotaxis
prokaryotes can react to chemical stimuli by moving toward food or way from a toxin
holophile
live in extremely salty enviorments
cyanobacteria
first use photosynthesis
Plasmid
Self replicate DNA separate from main chromosome
Nucleoid
Irregular shaped region that contains DNA