The genitourinary system is one of the portals of entry for pathogens. Many antimicrobial medications are excreted in the urine in concentrations higher than in the blood. The flushing action of urination is a key defense mechanism against bladder infections. The fallopian tubes can provide a passageway for pathogens to enter the abdominal cavity. The uterine cervix is a common site of infection by sexually transmitted pathogens. Prostate enlargement predisposes men to urinary infection.
■ Name two kinds of cells that help defend the bladder against infection.
■ Would ammonia make the urine basic? How?
25.3 Urinary System Infections 635
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Our internal organs, the colon, liver and intestines, help our bodies eliminate toxic and harmful matter from our bloodstreams and tissues. Often, our systems become overloaded with waste. The very air we breathe, and all of its pollutants, build up in our bodies. Today’s over processed foods and environmental pollutants can easily overwhelm our delicate systems and cause toxic matter to build up in our bodies.