Chapter 23

Which of the following is NOT true about the sense of taste?

Molecules that can stimulate a particular type of chemoreceptor will also stimulate chemoreceptors of different types, as long as they are all located on the tongue.

Botulinum toxin (Botox) is one of the most poisonous substances known. A few hundred grams is enough to kill every person on Earth. Botox causes paralysis in its victims. Which neurotransmitter does Botox most likely affect?

acetylcholine

Broca's Area of the brain is responsible for

coordinating speech.

In a terrible car accident, a person receives a severe blow to their head that damages one specific region of their brain, causing their heart to stop beating. What region is this most likely to be?

medulla

Mercury poisoning can damage the myelin sheath that surround some neurons. This is most similar to the effects of which disease?

multiple sclerosis

The buildup of adenosine in the brain causes

sleepiness.

An action potential is initiated by

the opening of a large number of sodium ion channels.

What is the difference between a nerve and a neuron?

A nerve is a bundle of axons, while a neuron is a single cell that has only a single axon.

Which of the following is NOT one of the functions of an endoskeleton?

All of the above are important functions of an endoskeleton.

External signals are first picked up by which part of a neuron?

dendrites