Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892



Biology: The Dynamic Science (Mind...

4th Edition
Peter J. Russell + 2 others
ISBN: 9781305389892
Textbook Problem

In terrestrial animals:

a. the hairs of taste receptors are derived from cilia and containmicrotubules.

b. the hairs of smell receptors are derived from microvilli andcontain microfilaments.

c. signals from taste receptors are relayed to the cerebellum.

d. olfactory receptors are located primarily in the mouth.

e. nerve connections from the olfactory bulbs lead to thecerebral cortex.

Summary Introduction


The terrestrial animals, especially vertebrates, have five sense organs, which are the ears, eyes, nose, skin, and tongue. These sense organs receive stimuli from the external environment, and transduce those signals to the brain in the form of action potential. Each sense organ has receptors that generate a receptor potential in response to a particular type of signal.


Explanation/justification for the correct answer:

Option (e) states that the nose receives chemical signals in the form of smell. The chemicals present in food, or perfume hit the olfactory neurons, which generates electrical signals. The olfactory receptors have hair like structures that detect the chemicals when they are dissolved in the mucus of the nose. The olfactory bulbs contain many synapses, which are created by olfactory receptors, and interneurons. The signals are then carried via the olfactory route into the olfactory cortex of the brain. Hence, option (e) is the correct answer.

Explanation for incorrect answer:

Option (a) states that the taste receptors contain hair-like extensions, which are derived from microvilli instead of cilia. The hair like extensions contain microfilaments and not microtubules. The cilia are the origin of the hair like structures present in smell receptors. They contain microtubules instead of microvilli...

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