Do Now: Homeostasis is the maintenance of relatively stable internal physiological conditions as bod

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Do Now Homeostasis is the maintenance of
relatively stable internal physiological
conditions (as body temperature or the pH of
blood) in higher animals under fluctuating
environmental conditions. How can homeostasis be
disrupted in the human digestive system?
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Disorders of the Digestive System
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Aim What are the causes and effects of some
disorders of the human digestive system?
I. Digestive System Disorders
Think about the main function of the large
intestine. What would happen if the large
intestine did not perform its main function
properly?
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A. Diarrhea - loose, watery stools occurring more
than three times in one day.
1. Causes include viral, bacterial, or parasitic
infections food intolerance (ex lactose in
milk) and reactions to medicine. All of these
may cause the large intestine not to reabsorb
enough water back into the body.
How can chronic (of long duration) diarrhea
affect someone?
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B. Constipation - constipation means hard stools,
difficulty passing stools (straining), or a sense
of incomplete emptying after a bowel movement.
1. Theoretically, constipation can be caused by
the slow passage of digesting food through any
part of the intestine, (mostly the colon) causing
more water than usual to be absorbed.
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C. Ulcer an open sore that can occur in the
lower esophagus, stomach, and most often in the
upper portion of the small intestine (duodenum).
Ulcer locations
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Why do ulcers hurt?
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hint
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1. Today, research shows that most ulcers
develop as a result of infection with bacteria.
a. Bacteria damage the protective lining of the
stomach.
2. Lifestyle can also fuel an existing ulcer.
a. smoking, drinking alcohol, stress, and
consuming caffeine can increase the chances of
getting an ulcer.
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D. Appendicitis - is an inflammation of the
appendix.
1. Appendicitis occurs when the interior of the
appendix becomes filled with something that
causes it to swell, such as mucus, stool, or
parasites. The appendix then becomes irritated
and inflamed. It can become deadly if not
treated immediately.
Inflamed appendix
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If the appendix has no true life function, why is
it dangerous if it is inflamed or ruptured?