Question

Which of the following statements is true regarding olfaction? list all that apply

• Smell is a chemical sense.  
• Odorant molecules dissolve in mucus before stimulating a receptor.  
• Humans can only distinguish up to 200 odors.  
• Olfactory receptors have hairs on the apical surface that respond to stimuli.
  When olfactory receptors are stimulated a receptor potential is created. 

Answer 1

Options a, b and d are correct.

A.) Smell is a chemical sense.
B.) Odorant molecules dissolve in mucus before stimulating a receptor
D.) Olfactory receptors have hairs on the apical surface that respond to stimuli