Which of the following statements regarding animals is false?
Animals that extract food particles suspended in the surrounding water are called fluid feeders.
During which of the following stages of food processing is undigested material removed from the digestive tract?
_____ is secreted by the _____ and acts to emulsify _____ in the _____.
Bile ... liver ... fats ... small intestine
An animal digestive tract that consists of two openings (a mouth and anus) is called
the alimentary canal.
An alimentary canal is best defined as
a tube-shaped compartment for the transport, digestion, and absorption of food.
Which lists the major segments of the alimentary canal in the correct order?
oral cavity, esophagus, stomach, small intestine, large intestine
Several important enzymes and other secretions aid in digestion as food moves down the alimentary canal, as follows: •in the oral cavity, salivary amylase helps break down _____;
•in the stomach, pepsin helps break down _____;
•and in the small intestine, bile helps break down _____.
starches; proteins; fats and oils
Chyme enters the small intestine from the stomach. At this point, _____.
mechanical digestion is essentially complete, but the other processes are ongoing or have not yet begun
Which of the following correctly lists the order of the parts of the human digestive system, from first to last contact with food matter?
oral cavity, pharynx, esophagus, stomach, small intestine, large intestine
The digestion of carbohydrates begins in the mouth. What is the name given to the starch-digesting enzyme secreted by salivary glands?
Which of the following mechanisms helps prevent the gastric juice from destroying the stomach lining?
generation through mitosis of new cells to replace the stomach lining
The function of the sphincter between the stomach and small intestine is to
periodically release chyme into the small intestine in squirts.
When the wall of the stomach cannot protect the organ from the effects of digestion, the result is
a gastric ulcer.
Epithelial cells lining the intestine have surface projections that increase nutrient absorption. These projections are called
What is the main digestive function of the pancreas?
to produce digestive enzymes and an alkaline solution
Nutrients absorbed by the intestines move directly to the liver, which
converts excess glucose to glycogen.
Which of the following statements regarding animal digestive systems is false?
Meat is more difficult to digest than vegetable matter because of its protein content.
Interestingly, most herbivorous animals do not have the ability to digest the cellulose in plants. However, in the absence of this ability, they have evolved a mechanism that allows them to survive despite eating only plant matter, namely
digestion by symbiotic microorganisms.
Which of the following digestive system structures is greatly expanded in size in koalas, resulting in a very large surface area for prokaryotes to digest plant material?
A material that must be ingested in preassembled form because the animal cannot synthesize it is
an essential nutrient.
Essential fatty acids, which are required in the human diet, are
those fatty acids that humans are unable to synthesize.