1. group 7 initial D
Group members: qihang
zhou bo
marcus
bryan

2. The human
digestive system

3. anus
The anus is an opening where the
waste products are passed out
from the rectum. When a person
wakes up, he/she would have an
urge to pass faeces. . Others will
tends to have that feeling when
they have just finish eating the
food, whether the food is part of
breakfast, lunch or dinner. This
means that another process of the
digestion is happening again.
The anus

4. Where the anus is located
The human anus is situated between

the buttocks, posterior to the
perineum. It has two anal sphincters,
one internal, the other external.

5. External Sphincter of the Anus
The job and function of the External

Sphincter of the Anus is that it keeps
the exit close throughout the day.
But, the External sphincter may not
do its job properly. That is when you
have a diarrhea, and have problems
controlling the faeces

6. Internal Sphincter of the Anus
The job of the Internal Sphincter of

the anus is to keep the waste
products from our body from leaving
the body before its time and
escorting it out when the time is
right. It is an involuntary muscle,
which means it does its job on its
own without any orders.

7. Illness you can get in or out of the
anus
Anal fissures: It is a problem when

unnatural cracks or tear in the skin
of the anal canal. they may cause
severe periodic pain after defecation
Most anal fissures are caused by
stretching of the anal mucosa
beyond its capability.

8. Illness you can get in or out of the
anus
piles are swelling and inflammation

of veins in the rectum and anus. It is
caused by increased straining during
bowel movements caused by
constipation or diarrhea, which may
lead to hemorrhoids

9. rectum
The function: to act as a temporary

storage facility of feces. However if
defection is delayed for a prolonged
period, constipation and hardened feces
results.
The process: As food moves through it,

the colon absorbs water while forming
waste products, or stool. Muscle
contractions in the colon push the stool
toward the rectum. By the time stool
reaches the rectum, it is solid because
most of the water has been absorbed. So
the rectum is the end of the digestive tract
after the colon and before the anus.

10. Where is it located?
The rectum is the final
straight portion of the
large intestine in some
mammals.
The first 6 feet of the
large intestine are called
the large bowel or colon.
The last 6 inches are
the rectum and the anal
canal.
rectum

11. Common diseases of the rectum
There are also common diseases like
•
rectum bleeding. Rectum bleeding,
refers to passages of bright red blood
from the anus, often mixed with stool
and / or blood cells.
•Symptoms related to the rectum
can occur from colon cancer,
hemorrhoids, rectal prolapse, anal
warts or polyps. Infectious processes
can occur from ruptured of a polyp of
infection within a colon cancer.

12. appendix
• Location
It is attached to the first
part of our large intestine

13. Functions of appendix
• The appendix has no known function in
humans. Evidence suggests that our
evolutionary ancestors used their
appendixes to digest tough food like tree
bark, but we don't use ours in digestion
now. Some scientists believe that the
appendix will disappear from the human
body.

14. Functions of appendix
• Althought the appendix have no known
functions, the appendix is rich in infection-
fighting lymphoid cells suggesting that it
might play a role in our immune system.
Whether the appendix has a function or
not, it can be removed without any ill
effects.

15. Diseases of appendix
• Appendicitis- Indigestible food delivered
from the small intestine to the large intestine
flows into the appendix and is forced out by
contraction of the muscular walls of the
appendix. A blockage in the opening where
the appendix attaches to the large intestine
can lead to inflammation of the appendix,
known as appendicitis. This can cause acute
pain, fever, nausea, vomiting and loss of
appetite, but can be cured easily by
removing the appendix.

16. acknowledgements
www.yahoo.com

 www.wikipedia.org
 http://www.myelectron
icmd.com/m_bt.php

17. Thank you for your attention.