Ch 12 Nervous Tissues

Question 1

At the normal resting membrane potential of a typical neuron it’s sodium potassium exchange pump transports

Answer 1

Three intracellular sodium ions for one extracellular potassium ion

Question 2

What triggers the release of a acetylcholine from a synaptic terminal

Answer 2

Diffusion of calcium ions into the synaptic terminal

Question 3

The minimum stimulus required to trigger an action potential is known as the

Answer 3

Threshold

Question 4

Are the most numerous type of neuron in the CNS

Answer 4

Interneurons

Question 5

The part of the peripheral nervous system that carries sensory information to the CNS is designated

Answer 5

Afferent

Question 6

The rabies virus travels to the CNS via

Answer 6

Retrograde axoplasmic transport

Question 7

ESPS occurs when

Answer 7

Extra sodium ions enter a cell

Question 8

Which type of synapse is most common in the nervous system

Answer 8

Chemical

Question 9

The Myelin sheath that covers many CNS axons is formed by

Answer 9

Oligodendrocytes

Question 10

Cholnergic synapsis releases the neurotransmitter

Answer 10

Acetylcholine

Question 11

Branches that may occur along an axon are called

Answer 11

Collaterals

Question 12

Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated

Answer 12

Spatial summation

Question 13

What provides information about the external environment

Answer 13

Exteroceptors

Question 14

Which of the following is not involved in creating the resting membrane potential of a neuron

Answer 14

Membrane permeability for sodium ions greater than potassium ions

Question 15

A shift of the resting transmembrane potential towards zero MB is called

Answer 15

Depolarization

Question 16

Regions of the CNS were neurons cell bodies dominate constitute the

Answer 16

Gray matter

Question 17

The presence of what dramatically increases the speed at which an action potential moves along an axon

Answer 17

Myelin

Question 18

Ion channels that are always open or called

Answer 18

Leak channels

Question 19

What division of the nervous system carries motor commands to muscle glands

Answer 19

Efferent

Question 20

The all or nothing principal states that

Answer 20

All stimuli great enough to bring the membrane threshold will produce identical action potentials

Question 21

Neurons that have one axon and one dendrite with the soma in between are called

Answer 21

Bipolar

Question 22

The largest and most numerous of the glial cells in the central nervous system are

Answer 22

Astrocytes

Question 23

Neuroglia of the peripheral nervous system include

Answer 23

Satellite sells Ann Schwann cells

Question 24

These branching neuron processes serve as receptive regions and transmit electrical signals toward the cell body they are called

Answer 24

Dendrites

Question 25

Neuron fibers running through the central nervous system form tracks of

Answer 25

White matter

Question 26

Neurons can be classified according to function. Or motor neurons carry electrical signals from the central nervous system primarily to muscles or glands

Answer 26

Efferent

Question 27

These nervous system cells are highly specialized to transmit messages throughout the body

Answer 27

Neurons

Question 28

Chromatophilic substance found within the cell bodies of neurons is involved in the metabolic activities of the cell and is composed of

Answer 28

Rough endoplasmic reticulum

Question 29

This part of the neuron generates and conducts action potentials

Answer 29

Axon

Question 30

What forms synapses or junctions with other neurons or effector cells

Answer 30

Axon terminal

Question 31

The four nation of myelin in the peripheral nervous system is accomplished by these cells

Answer 31

Schwann cells

Question 32

Milan is important in

Answer 32

Insulating axons and increasing the conduction velocity of action potentials

Question 33

A bundle of axons in the CNS is called

Answer 33

A tract

Question 34

A cluster of neurons in the peripheral nervous system is called a

Answer 34

Ganglion

Question 35

Oligodendrocytes form myelin around

Answer 35

Several axons in the central nervous system

Question 36

Festivals in the axon terminal contain

Answer 36

Neurotransmitters

Question 37

You have lost the sensation but not movement and one of your hands due to a problem with your spinal cord neurons based upon these symptoms what type of neuron was most likely affected

Answer 37

Afferent neuron

Question 38

Enter neurons in the brain are likely to be

Answer 38

Multipolar

Question 39

These neurons transmit impulses from CNS to effectors

Answer 39

Motor neurons

Question 40

These glial cells play a role in capillary neuron exchanges in control the chemical environment around the neurons

Answer 40

Astrocytes