Download Digestion Disorders

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?
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?
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?
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.
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
Why do ulcers hurt?
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hint
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.
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
If the appendix has no true life function, why is it
dangerous if it is inflamed or ruptured?