Nonspecific Mechanisms of Defense

Nonspecific Mechanisms of Defense - Nonspecific Mechanisms...

Info iconThis preview shows page 1. Sign up to view the full content.

View Full Document Right Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Nonspecific Mechanisms of Defense The body possesses many mechanisms that impart nonspecific defense. The objectives of these mechanisms are to prevent microorganisms from gaining a foothold in the body and to destroy them if they penetrate to the deeper tissues. Mechanical barriers. Mechanical barriers at the portal of entry represent the first line of defense for the body. These defenses are normally part of the body's anatomy and physiology. The skin is a representative example. The outermost layers of skin consist of compacted, cemented cells impregnated with the insoluble protein keratin. The thick top layer is impervious to infection and water. In the unbroken state, it usually is not penetrated by pathogens. The mucous membranes of the urinary, respiratory, and digestive tracts are another example. They are moist and permeable, but their fluids, such as tears, mucus, and saliva, rid the membrane of...
View Full Document

This note was uploaded on 11/11/2011 for the course BIO 101 taught by Professor Pesthy during the Fall '07 term at Texas State.

Ask a homework question - tutors are online