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Name the structures of the human alimentary canal (in order)
Oral cavity, pharynx, esophagus, stomach, small intestine, large intestine.
What enzyme does saliva contain and what does it digest?
Saliva contains salivary amylase, which digests starch (carbohydrates).
(T/F) Chief cells secrete HCl into the stomach.
False, chief cells secrete pepsinogen into the stomach; parietal cells secretes HCl into the stomach.
What is peristalsis?
Peristalsis is defined as the wave-live smooth muscle contractions that propel food through the digestive tract.
What do parietal cells secrete into the stomach?
Parietal cells secrete HCl into the stomach.
What two sphincters separate the stomach from the rest of the alimentary canal?
The cardiac sphincter and the pyloric sphincter.
What are the three segments of the small intestine?
The small intestine is divided into the duodenum, jejunum, ileum.
Which segment(s) of the small intestine is/are primarily responsible for digestion?
The duodenum is primarily responsible for digestion.
Which segment(s) of the small intestine is/are primarily responsible for absorption?
The jejunum and ileum are primarily responsible for absorption.
Why is pancreatic juice basic (high pH)?
Pancreatic juice contains bicarbonate ion, which serves to neutralize the acidic chyme from the stomach. This is necessary because pancreatic enzymes work best at the slightly basic pH.
(T/F) Bile is manufactured in the liver, stored in the gall bladder, and facilitates lipid digestion.
What are the three components of the large intestine?
The large intesting is divided into the cecum, colon and rectum.
What is the primary function of the large intestine?
The large intestine functions primarily to absorb water and salts.
Where do protein digestion and lipid digestion begin?
Protein digestion begins in the stomach and lipid digestion begins in the small intestine.
Which component of the nervous system inhibits digestion? Which components promotes digestion?
The sympathetic nervous system inhibits digestion. The parasympathetic nervous system stimulates digestion.
Match the following enzymes with the site of function and the nutrient they digest.
- 1. c,f (Chymotrypsin/Small intestine/Protein)
- 2. b,f (Pepsin/Stomach/Protein)
- 3. c,g (Lipase/Small intestine/Lipid)
- 4. c,e (Sucrase/Small intestine/Starch)
- 5. c,f (Trypsin/Small intestine/Protein)
- 6. c.f Carboxypeptidase/Small intestine/Protein)
- 7. c,e (Maltase/Small intestine/Starch)
- 8. a,e (Salivary amylase/Mouth/Starch)