Identify the incorrect statement:
1. Constipation is caused by decreased motility in the large intestines
2. Diarrhea may result from decreased fluid absorption in the large intestines
3. A high intake of dietary fiber reduces the risk of constipation because it increases distension and motility in the large intestines
4. Bacterial diarrhea results from a bacterial toxin that blocks water channels in the cells of the large intestines

How does the muscularis layer of stomach differ from that in the other parts of the gut?

1. it has one layer of smooth muscle
2. it has two layers of smooth muscle
3. it has three layers of smooth muscle
4. it has four layers of smooth muscle

The layer in the wall of the alimentary canal that exhibits maximum variations is the:
1. Serosa
2. Muscularis
3. Mucosa
4. Submucosa

All the following statements regarding bile are true except:
1. Bile salts are derivatives of cholesterol
2. Bile is important in absorption of fat soluble substances
3. Bile also serves as a route of excretion of bile pigments
4. It is acidic in nature

A baby boy aged two years is admitted to play-school and passes through a dental check-up. The dentist observed that the boy had twenty teeth. Which teeth were absent?
1. Incisors
2. Canines
3. Premolars
4. Molars

Fructose is absorbed into the blood through mucosa cells of intestine by the process called
1. active transport
2. facilitated transport
3. simple diffusion
4. co-transport mechanism

If for some reason, our goblet cells are non-functional, this will adversely affect the
1. production of somatostatin
2. secretion of sebum from the sebaceous glands
3. maturation of sperms
4. smooth movement of food down the intestine

Which one of the following pairs of food components in humans reaches the stomach totally undigested?
1. Protein and starch
2. Starch and fat
3. Fat and cellulose
4. Starch and cellulose

The structural and functional units of liver are:
1. The four hepatic lobes containing the hepatic sinusoids lined by kupffer cells
2. The hepatic lobules containing hepatic cells arranged in the form of cords
3. The porta hepatis which carries the common bile duct and common hepatic artery, and the opening for the portal vein.
4. The right and the left lobes separated by the falciform ligament

The oral cavity initiates all the following except:
1. Chemical process of digestion
2. Mechanical process of digestion
3. Deglutition
4. Peristalsis