Biology, Eighth Edition (Raven)

Chapter 48: The Digestive System

Post Test

The submucosa: (p .965)
A)is a layer of muscle tissue.
B)is composed of connective tissue.
C)is the innermost tissue layer of the gut.
D)contains an epithelial lining.
E)both b and c
An animal with large cuspid teeth is likely to be: (p. 966)
A)an omnivore.
B)a carnivore.
C)a herbivore.
D)a ruminant.
E)none of the above
The function(s) of HCl in the stomach is/are: (p. 968)
A)to activate pepsinogen to become pepsin.
B)to kill most bacteria.
C)to help denature food proteins.
D)to provide the optimal pH for pepsin.
E)all of the above
Bile pigments: (p. 970 - 971)
A)emulsify fats.
B)are waste products from the liver.
C)are stored and concentrated in the gallbladder.
D)complete the breakdown of proteins.
E)both b and c
The large intestine: (p. 972)
A)is longer than the small intestine.
B)has villi and microvilli.
C)completes the digestive process.
D)absorbs water, electrolytes and products of bacterial metabolism.
E)all of the above
Coprophagy: (p. 974)
A)occurs in carnivores.
B)occurs in nonruminant herbivores.
C)occurs in ruminant herbivores.
D)is the eating of feces.
E)both b and d
The duodenum secretes the following hormones: (p. 975)
A)cholecystokinin, secretin,
B)cholecystokinin, secretin, gastric inhibitory peptide
C)gastrin, secretin,
D)cholecystokinin, secretin, gastrin
E)chymotripsin, secretin, gastric inhibitory peptide
The hormones insulin and glucagon are produced by different cells in the pancreas and have antagonistic effects. Insulin promotes the cellular uptake of glucose into liver, muscle and fat cells. What occurs when blood glucose levels increase? (p. 977)
A)There is decreased insulin and glucagon production.
B)There is increased glucagon production.
C)Glycogen is hydrolyzed by the liver and glucose is released into the blood.
D)There is increased insulin production.
E)both b and c
Leptin is a peptide hormone that is thought to be the main signaling molecule in the afferent portion of the control circuit for food intake. However, it is found in normal, or even high levels, in obese people. What might be a possible reason for this? (p. 978)
A)a mutant, non-functional form of leptin is present
B)lack of leptin receptors in adipose cells
C)reduced sensitivity to leptin in the brain
D)none of the above
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