Exam 44: Animal Sensory Systems

Mammals have a family of 500 and 1000 genes that encode receptor proteins on the surface of odour- receptor neurons. If all mammals have these genes, why do some mammals have a better sense of smell than others do?

How do citrus fruits such as lemons cause the basic taste of sour?

A salmon follows a scent trail upstream to find its way back to the stream where it hatched. What type of sensory receptor cell would it use?

Which type of receptor would you expect to be most abundant in the antennae of a moth?

How would an abnormally large oval window in a mouse affect that animal's hearing?

How would the vision of a fly be affected if several of the axons extending from the ommatidia of its compound eye were damaged?

Compared to human eyes, the eyes of cephalopods squid and octopus)

Hair cells in the vertebrate ear are responsible for transducing sound pressure waves. Ion channels in the hair cell membrane open when

Two students studying physiology taste a known "bitter" substance, and both report sensing bitterness. They then sample another substance. Student A reports sensing both a bitter taste and a salty taste, but student B reports only a salty taste. What is the most logical explanation?

How could you genetically modify an animal so that it would distinguish more shades of green?

You have a baby that does not seem to respond to sound. Upon thorough investigation by the doctor, there is nothing visibly wrong with the baby's ears. What internal issue may there be that is causing hearing impairment in your baby?

Pit vipers can detect and strike in complete darkness because of their ability to detect

Light reflecting off an object in the environment is detected by photoreceptors after following which path?

Which of the sequence of events below best describes how hair cells sterocilia) in the rabbit ear provide the brain with information about stimulus intensity?

Which type of receptor is involved in sound detection?

A person able to hear only high- frequency sounds would probably have which of the following structural problems in the ear?

Sound waves arriving at a listener first strike the membrane.

Deafness caused by loud sounds often results from damage to which receptor cells?

What is the function of sensory receptor cells?

Partial or complete loss of hearing deafness) can be caused by damage to the