Chapter 5

Which develops first, a neuron's axon or its dendrites?

In which brain areas do new neurons form in adults?

What class of chemicals prevents apoptosis?

At what age does a person have the greatest number of neurons - before birth, during childhood, during adolescence, or during adulthood?

Anesthetic drugs increase inhibition of neurons, blocking most action potentials. Why would we predict that exposure to anesthetics might be dangerous to the brain of a fetus?

What are the two kinds of stroke, and what causes each kind?

Is collateral sprouting a change in axons or dendritic receptors?

Is denervation supersensitivity a change in axons or dendritic receptors?

Cite an example in which reorganization of the brain is helpful and one in which it is harmful.

Suppose someone has suffered a spinal cord injury that interrupts all sensation from the left arm. Now he or she uses only the right arm. Of the following, which is the most promising therapy: electrically stimulate the skin of the left \(\operatorname{arm},\) tie the right arm behind the person's back, or blindfold the person?