Chapter 13 Practice

Question 1

Which part of a neuron conducts an action potential?

Answer 1

Axon

Question 2

Which of the following are specific functions of the nervous system?
• Generate motor input
• Perform information processing and integration
• Receive sensory input
• Transport of hormones
• Perform hematopoiesis

Answer 2

• Generate motor input
• Perform information processing and integration
• Receive sensory input

Question 3

A nerve is a bundle of ______.

Answer 3

axons

Question 4

What is the order of events of an action potential?

Answer 4

1. Stimulus causes the axon to reach its threshold
2. Depolarization occurs as sodium gates open and sodium ions move inside the axon
3. Repolarization occurs when potassium gates open and potassium ions move outside of the axon
4. Sodium-potassium pump returns ions to their resting positions

Question 5

Match the nervous tissue cell on the left to the correct function on the right.

Answer 5

Neurons - transmission of impulses

Neuroglia - Support and nourishment of cells

Question 6

Nerve tissue contains two types of cells: ______ and ______.

Answer 6

Neurons, neuroglia

Question 7

The nerves of the human body make up the ______.

Answer 7

Peripheral nervous sytem

Question 8

During saltatory conduction, ______ potentials occur only at the nodes of Ranvier.

Answer 8

Action

Question 9

Which term refers to the event that activates a neuron and begins an action potential?

Answer 9

Stimulus

Question 10

Which class of neurons takes nerve signals from a sensory receptor to the central nervous system?

Answer 10

Sensory

Question 11

A soon as the action potential has passed by each successive portion of an axon, that portion undergoes a short ______ period during which it is unable to conduct an action potential.

Answer 11

Refractory

Question 12

The rapid movement of sodium ions into a neuron during an action potential causes ______ of the cell membrane.

Answer 12

Depolarization

Question 13

The nervous system disorder that involves the loss of muscle control that results from the breakdown of myelin is called ______ ______.

Answer 13

Multiple sclerosis

Question 14

With respect to ion distribution associated with a neuron, ______ ions are more concentrated outside of the cell, and _______ ions are more concentrated inside.

Answer 14

Sodium, Potassium

Question 15

Nerve impulse conduction occurs more rapidly on a ______ axon.

Answer 15

Myelinated

Question 16

The summing up of excitatory and inhibitory signals received by a neuron is ______.

Answer 16

Integration

Question 17

The uneven distribution of ions associated with a neuron is maintained by the ______ ______ pump.

Answer 17

Sodium Potassium

Question 18

Neurotransmitters move across the synaptic cleft by the process of:

Answer 18

Diffusion

Question 19

The small gap between the sending and receiving neurons is the ______ ______.

Answer 19

Synaptic cleft

Question 20

The region where a sending neuron comes in close proximity to a receiving neuron is the:

Answer 20

Synapse