Around 60 – 70 % of starch is broken down to maltose in the duodenum by:
1. pancreatic amylase
2. trypsin
3. maltase
4. salivary amylase
In humans, the energy source that provides energy the quickest is:
1. protein
2. carbohydrate
3. lipid
4. vitamins
Most of the parasympathetic supply to the alimentary canal is by:
1. vagus nerve
2. thoracic spinal nerves
3. lumbar spinal nerves
4. sacral spinal nerves
What prevents GER [gastro esophageal reflux]?
1. lower esophageal sphincter
2. sphincter of Oddi
3. esophageal hiatus
4. glottis
The part of the small intestine that has maximum length is the:
1. duodenum
2. jejunum
3. ileum
4. colon
Identify the correct statement:
1. Cabohydrate digestion begins in the stomach
2. Polsaccharides are broken down to monosaccharides by amylase
3. Disaccharides are actively transported across the epithelium of the small intestine
4. Final luminal digestion of carbohydrates produces monosaccharides
Identify the correct statement regarding lipid digestion and absorption:
1. Most lipids are asorbed without digestion as they are not macromolecules
2. The products of lipid digestion are resynthesized into triglycerides in intestinal epithelial cells
3. The products of lipid digestion diffuse into capillaries in the vicinity of the intestinal epithelium
4. The products of lipid digestion travel in the circulatory system in the form of micelles
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