My boyfriend claims with extreme confidence that there is a muscle there (about 6-8in inside) and that pornstars are able to let things through (in reverse) during anal intercourse. I took an anatomy course though and don’t recall any such muscle….all that I know about are the internal and external anal sphincters, but those are both near the anus, not deep inside. Who’s correct, me or him?

1. Suppose you have two test tubes filled with clear fluids. One test tube is filled with tears, and the other is filled with saliva. What substance could you test for the presence of to tell which was saliva and which was tears?

2. What might be the result of a weakness of the sphincter between the esophagus and the stomach?

3. What would be the result of an absence of mucus on the lining of the stomach?

4. A condition that limits the ability of the small intestine to absorb would result in a decreased absorption of _________________

5. A condition that limits the ability of the large intestine to absorb would result in a decreased absorption of _________________

6. Some people are allergic to a protein in wheat. When these people eat foods made with wheat, a reaction destroys the villi in the small intestine. What problems would you expect these people to experience?

7. If your stomach could no longer produce acid, how do you think that would affect digestion?

8. From a chemical point of view, why is it important to chew your food thoroughly before swallowing?

9. A person’s blood has high cholecystokinin levels. What does this tell you about the presence or absence of chyme in the small intestine?

10. Some pathogenic bacteria in food can survive the stomach and small intestine, reaching the large intestine. There, they attack the lining of the colon. This irritates the colon, and goblet cells in the colon are stimulated to produce more mucus. This extra mucus can inhibit water absorption through the colon. What common digestive abnormality does this cause?

11. Another common digestive abnormality is “reverse peristalsis”. What is it?

NO ANSWER PLEASE DONT LEAVE ONE.
THANK YOU FOR THOSE WHO HAVE HELPED.

Place in order the pathway that ingested food follows through the digestive system.

1. Anus
2. Anal Canal
3. Ascending Colon
4. Cardiac Orifice
5. Cecum
6. Descending Colon
7. Duodenum
8. Esophagus
9. Ileocecal Valve
10. Ileum
11. Jejunm
12. Left Colic Flexure
13. Mouth
14. Pharynx
15. Pyloric Sphincter
16. Rectum
17. Right Colic Flexure
18. Sigmoid Colon
19. Stomach
20. Transverse Colon

Any help would be appreciated. THANK YOU!!!

Does the lining of arteries have anything that plaque can grab a foothold on and begin building up? I don’t believe these stories about people having gunk built up in their bowels for several years. I’m not familiar with anatomy, but I think the bowels have a mucus lining that nothing can stick to. Anyone know what the difference is?

Are humans omnivores or herbivores?
In: Nutrition [Edit categories]
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science and good old fashioned \"common sense\" would suggest humans are herbivores.

"When we kill animals to eat them, they end up killing us because their flesh, which contains cholesterol and saturated fat, was never intended for human beings, who are natural herbivores."

William C. Roberts, M.D., editor, American Journal of Cardiology

From "The Comparative Anatomy of Eating", by Milton R. Mills, MD

Facial Muscles
CARNIVORE: Reduced to allow wide mouth gape
HERBIVORE: Well-developed
OMNIVORE: Reduced
HUMAN: Well-developed

Jaw Type
CARNIVORE: Angle not expanded
HERBIVORE: Expanded angle
OMNIVORE: Angle not expanded
HUMAN: Expanded angle

Jaw Joint Location
CARNIVORE: On same plane as molar teeth
HERBIVORE: Above the plane of the molars
OMNIVORE: On same plane as molar teeth
HUMAN: Above the plane of the molars

Jaw Motion
CARNIVORE: Shearing; minimal side-to-side motion
HERBIVORE: No shear; good side-to-side, front-to-back
OMNIVORE: Shearing; minimal side-to-side
HUMAN: No shear; good side-to-side, front-to-back

Major Jaw Muscles
CARNIVORE: Temporalis
HERBIVORE: Masseter and pterygoids
OMNIVORE: Temporalis
HUMAN: Masseter and pterygoids

Mouth Opening vs. Head Size
CARNIVORE: Large
HERBIVORE: Small
OMNIVORE: Large
HUMAN: Small

Teeth: Incisors
CARNIVORE: Short and pointed
HERBIVORE: Broad, flattened and spade shaped
OMNIVORE: Short and pointed
HUMAN: Broad, flattened and spade shaped

Teeth: Canines
CARNIVORE: Long, sharp and curved
HERBIVORE: Dull and short or long (for defense), or none
OMNIVORE: Long, sharp and curved
HUMAN: Short and blunted

Teeth: Molars
CARNIVORE: Sharp, jagged and blade shaped
HERBIVORE: Flattened with cusps vs complex surface
OMNIVORE: Sharp blades and/or flattened
HUMAN: Flattened with nodular cusps

Chewing
CARNIVORE: None; swallows food whole
HERBIVORE: Extensive chewing necessary
OMNIVORE: Swallows food whole and/or simple crushing
HUMAN: Extensive chewing necessary

Saliva
CARNIVORE: No digestive enzymes
HERBIVORE: Carbohydrate digesting enzymes
OMNIVORE: No digestive enzymes
HUMAN: Carbohydrate digesting enzymes

Stomach Type
CARNIVORE: Simple
HERBIVORE: Simple or multiple chambers
OMNIVORE: Simple
HUMAN: Simple

Stomach Acidity
CARNIVORE: Less than or equal to pH 1 with food in stomach
HERBIVORE: pH 4 to 5 with food in stomach
OMNIVORE: Less than or equal to pH 1 with food in stomach
HUMAN: pH 4 to 5 with food in stomach

Stomach Capacity
CARNIVORE: 60% to 70% of total volume of digestive tract
HERBIVORE: Less than 30% of total volume of digestive tract
OMNIVORE: 60% to 70% of total volume of digestive tract
HUMAN: 21% to 27% of total volume of digestive tract

Length of Small Intestine
CARNIVORE: 3 to 6 times body length
HERBIVORE: 10 to more than 12 times body length
OMNIVORE: 4 to 6 times body length
HUMAN: 10 to 11 times body length

Colon
CARNIVORE: Simple, short and smooth
HERBIVORE: Long, complex; may be sacculated
OMNIVORE: Simple, short and smooth
HUMAN: Long, sacculated

Liver
CARNIVORE: Can detoxify vitamin A
HERBIVORE: Cannot detoxify vitamin A
OMNIVORE: Can detoxify vitamin A
HUMAN: Cannot detoxify vitamin A

Kidney
CARNIVORE: Extremely concentrated urine
HERBIVORE: Moderately concentrated urine
OMNIVORE: Extremely concentrated urine
HUMAN: Moderately concentrated urine

Nails
CARNIVORE: Sharp claws
HERBIVORE: Flattened nails or blunt hooves
OMNIVORE: Sharp claws
HUMAN: Flattened nails
What about the fact that many herbivorous animals CAN digest meat but we still consider them herbivores?