Transcript Pathogen

PATHOGENS
Syarafina, Miko & Amado
DEFINITION
A Pathogen is an organism or a virus that can
cause a disease.
 Patho – disease
 Gen – producer
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Figure 1: White Plague Pathogen obtained from
http://www.coral.noaa.gov/coral_disease/white_plague_pathogen.shtml
ROLE OF THE SKIN
Outermost skin is tough and protects the
body from pathogens entering.
 Moist that prevents the growth of fungi &
bacteria.
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Outermost Skin
Figure 2: Skin Image obtained from
http://www.cosmosclinic.com.au/skincare/images/skin.
jpg
ROLE OF MUCOUS MEMBRANES
Mucous membranes line
the internal cavities that
are exposed to external
environment.
 Mucous secreted has
antiseptic properties
from the enzyme
lysozyme.
 Traps pathogens and
either swallows or expels
it.
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Figure 2 Nasal Cavity obtained from
www.sedationfacts.org
INGESTION OF PATHOGENS IN BLOOD & BODY
TISSUES
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Leucocytes- Neutrophils
Migrate to infected tissues
Like Amoeba
Form vesicles
Digested by lysosomes
Process- Phagocytosis (form of endocytosis)
Macophages
http://highered.mcgrawhill.com/olcweb/cgi/pluginpop.cgi?it=swf::535::535::/si
tes/dl/free/0072437316/120068/bio02.swf::Endocyto
sis%20and%20Exocytosis
Figure 3: Phagocyte Image obtained from
http://ttmtan.myplace.nie.edu.sg/BI6101/2004/08/path
ogen/host.html
BIBLIOGRAPHY:
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Allott, Andrew, and David Mindorff. Biology - Course Companion.
Oxford UP, 2007. Print.
Dephoff, J. “About White Blood Cells” 30 Sept. 2009.
http://www.ehow.com/about_5398467_white-blood-cells.html
Fitzsimmons, Michael. “How Do White Blood Cells Work? EHow. 30
Sept. 2009. <http://www.ehow.com/how-does_5171339_do-whiteblood-cells-work.html>.
“Host Defenses” The Biology of Prokaryotes. 30 Sept. 2009.
http://ttmtan.myplace.nie.edu.sg/BI6101/2004/08/pathogen/host.
html
Kivi, Rose. "How Does a Pathogen Enter Your Body?" EHow. Web. 29
Sept. 2009. <http://www.ehow.com/how-does_4574044_pathogenenter-body.html>.
Williams, Brian. “How Do Phagocytes Destroy Microscopic Invaders?”
EHow. 30 Sept. 2009. <http://www.ehow.com/howdoes_5179866_do-phagocytes-destroy-microscopic-invaders.html>.