Draw And Label Olfactory Organ

O bserve the olfactory epithelium in the microscope set up by the laboratory instructor. The olfactory receptor cells are spindle-shaped, bipolar neurons with spherical nuclei. They also have six to eight cilia at their distal ends. The supporting cells are pseudostratified columnar epithelial cells. However, in this region the tissue lacks goblet cells. (See fig. 32.2.)

Figure 32.1 Label this diagram of the olfactory organ by placing the correct numbers in the spaces provided.

Superior

_Cilia

_Columnar epithelial cells

_Cribriform plate of ethmoid bone

_Nasal cavity

_Nerve fibers within olfactory bulb

_Olfactory nerves

Olfactory receptor cells

Figure 32.1 Label this diagram of the olfactory organ by placing the correct numbers in the spaces provided.

Diagram The Olfactory Organ

Inferior

Inferior

Figure 32.2 Olfactory receptors have cilia at their distal ends (250x).

Figure 32.2 Olfactory receptors have cilia at their distal ends (250x).

Goblet Epithelial Cells Diagram

Connective tissue

Olfactory epithelium

Figure 32.3 Label this diagram by placing the correct numbers in the spaces provided.

Figure 32.3 Label this diagram by placing the correct numbers in the spaces provided.

Identify And Label Cilia And Microvilli

4. Test your laboratory partner's ability to recognize the odors of the bottled substances available in the laboratory. To do this, follow these steps:

a. Have your partner keep his or her eyes closed.

b. Remove the stopper from one of the bottles and hold it about 4 cm under your partner's nostrils for about 2 seconds.

c. Ask your partner to identify the odor, and then replace the stopper.

d. Record your partner's response in Part B of the laboratory report.

e. Repeat steps b-d for each of the bottled substances.

5. Repeat the preceding procedure, using the same set of bottled substances, but present them to your partner in a different sequence. Record the results in Part B of the laboratory report.

6. Wait 10 minutes and then determine the time it takes for your partner to experience olfactory sensory adaptation. To do this, follow these steps: a. Ask your partner to breathe in through the nostrils and exhale through the mouth.

b. Remove the stopper from one of the bottles and hold it about 4 cm under your partner's nostrils.

c. Keep track of the time that passes until your partner is no longer able to detect the odor of the substance.

d. Record the result in Part B of the laboratory report.

e. Wait 5 minutes and repeat this procedure, using a different bottled substance.

f. Test a third substance in the same manner.

g. Record the results as before.

7. Complete Part B of the laboratory report.

Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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