Digestive Organs
Purpose of the Exercise
To review the structure and function of the digestive organs and to examine the tissues of these organs.
Pre-Lab
Carefully read the introductory material and examine the entire lab. Be familiar with the basic structures and functions of the digestive organs from lecture or the textbook. Answer the pre-lab questions.
Pre-Lab Questions: Select the correct answer for each of the following questions:
1. Which of the following digestive organs possesses villi?
a. esophagus
b. stomach
c. small intestine
d. large intestine
2. Which is a major function of the oral cavity?
a. absorb water
b. mechanical digestion
c. secrete hydrochloric acid
d. emulsify fat
3. Bile is produced in the
a. small intestine.
b. pancreas.
c. gallbladder.
d. liver.
4. The ________ is the exposed part of a tooth.
a. crown
b. neck
c. root
d. periodontal ligament
5. The ________ sphincter is the muscular valve at the exit of the stomach.
a. lower esophageal
b. pyloric
c. hepatopancreatic
d. ileocecal
6. The stomach can stretch enough to hold the contents of a large meal because it has
a. the pyloric antrum.
b. a fundus region.
Materials Needed
Human torso model
Head model, sagittal section
Skull with teeth
Teeth, sectioned
Tooth model, sectioned
Paper cup
Compound light microscope
Prepared microscope slides of the following:
Sublingual gland (salivary gland)
Esophagus
Stomach (fundus)
Pancreas (exocrine portion)
Small intestine (jejunum)
Large intestine
Learning Outcomes
After completing this exercise, you should be able to
1 Sketch and label the structures of tissue sections of digestive organs.
2 Locate the major organs and structural features of the digestive system.