Chapter 13 Practice Flashcards Preview

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Flashcards in Chapter 13 Practice Deck (20):
1

Which part of a neuron conducts an action potential?

Axon

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

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

3

A nerve is a bundle of ______.

axons

4

What is the order of events of an action potential?

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

5

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

Neurons - transmission of impulses
Neuroglia - Support and nourishment of cells

6

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

Neurons, neuroglia

7

The nerves of the human body make up the ______.

Peripheral nervous sytem

8

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

Action

9

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

Stimulus

10

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

Sensory

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.

Refractory

12

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

Depolarization

13

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

Multiple sclerosis

14

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

Sodium, Potassium

15

Nerve impulse conduction occurs more rapidly on a ______ axon.

Myelinated

16

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

Integration

17

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

Sodium Potassium

18

Neurotransmitters move across the synaptic cleft by the process of:

Diffusion

19

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

Synaptic cleft

20

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

Synapse