Exam 25: The Nervous System

The figure below illustrates how a neuron with myelinated axon transmits signals. What is happening in Region A of this figure?

If a stimulus is strong enough to reach a threshold level,

In vertebrates, special cells produce an insulating sheath of _______ that wraps around the axon of a neuron.

The __________ nervous system ferries signals to and from the central nervous system.

You bite into a juicy peach. What region of the cerebrum interprets the flavors in your mouth?

Where would you expect to see an absence of neurotransmitters?

When a signal causes sodium ions to flow into a neuron it becomes ___________.

Axons transmit self-_______ electrical signals.

After a long hard workout, you feel thirsty. What part of the brain stimulated your thirst?

One reason that the human race will probably not evolve larger brains is that it takes a lot of energy to run such a thinking machine.

The flow of ions across an axon's plasma membrane generates an electrical impulse known as the _____________.

_________ neurons receive information from the environment whereas ________ neurons carry out the orders of the central nervous system.

After a signal has been transmitted to a receiving cell, neurotransmitters are rapidly removed from the synaptic cleft because

Which of the following statements about axons is false?

In order to respond to an incoming signal, such as your fingertip being burned by a candle's flame, the signal must be transmitted to the brain before your muscles can be told to respond and pull away.

Which of the following statements about a reflex arc is false?

Which of the following best describes the flow of signals in our nervous system?

A strong stimulus produces

The cerebral cortex of the human brain is much more highly and intricately folded than the same region in other animals. Why might this be the case?

As a whole, the nervous system converts stimuli into _______ input-action potentials that convey information about stimuli.