BIO 140 Human Biology I - Questions and Solutions

1. Which of these processes occurs in the mouth?

1. ingestion
2. mechanical digestion
3. chemical digestion
4. all of the above

2. Which of these processes occurs throughout most of the alimentary canal?

1. ingestion
2. propulsion
3. segmentation
4. absorption

3. Which of the following stimuli activates sensors in the walls of digestive organs?

1. breakdown products of digestion
2. distension
3. pH of chyme
4. all of the above

4. Which of these statements about reflexes in the GI tract is false?

1. Short reflexes are provoked by nerves near the GI tract.
2. Short reflexes are mediated by the enteric nervous system.
3. Food that distends the stomach initiates long reflexes.
4. Long reflexes can be provoked by stimuli originating outside the GI tract.