SOPHIA will be down Wednesday, December 13, 2017 at 3:30 AM (CST) for a little housecleaning. We are sorry if this causes you any trouble. The outage should last less than 5 minutes.

Don't lose your points!
Sign up and save them.
+
Pathogens

Pathogens

Author: Nathan Lampson
Description:

This lesson will give an overview of the body's three lines of defense against a pathogen.

(more)
See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

28 Sophia partners guarantee credit transfer.

281 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 25 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.

Tutorial
Terms to Know
Adaptive Immunity

Also known as specific immunity, adaptive immunity is carried out by T & B lymphocytes and reacts to specific antigens of cells; adaptive immunity also produces memory cells to target the same pathogen if we are ever exposed to it again.

Innate Immunity

Also known as non-specific immunity, innate immunity consists of general physiologic responses (fever, inflammation, etc.) that can affect the entire body.

Pathogen

Any disease-causing agent that we are exposed to (bacteria, virus, fungus, parasite, etc.)

Physical Barriers

Consists of skin and mucous membranes, physical barriers are our first line of defense against pathogens. Physical barriers are part of our non-specific immunity.