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LECTURE SLIDE QUESTIONS

front 1

The nervous system has three overlapping funcTIons. Which of the following represents a logical sequence of these three funcTIons?

A. Sensory input, motor output, integraTIon

B. Motor output, integration, sensory input

C. Sensory input, integration, motor output

D. Integration, sensory input, motor output

back 1

C. Sensory input, integration, motor output

front 2

The portion of an axon that communicates with its target cell is the _______.

A. dendrite B. axon C. axon terminal D. cell body

back 2

C. axon terminal

front 3

A change in membrane potential from -70 mV to -40 mV would be termed __________.

A. repolarization B. depolarization C. hyperpolarization D. hypopolarization

back 3

no data

front 4

Generally speaking, opening chloride channels in the postsynaptic membrane will result in an _______.

A. excitatory postsynaptic potential

B. excitatory presynaptic potential

C. inhibitory postsynaptic potential

D. inhibitory presynaptic potential

back 4

C. inhibitory postsynaptic potential

front 5

__________ has occurred when a neuron is stimulated by more than one terminal.

A. Temporal summation

B. Spatial summation

C. Synaptic delay

D. Synaptic potentiation

back 5

B. Spatial summation

front 6

Generation of an action potential can be inhibited by all of the following except: ___________.

A. IPSPs B. presynaptic inhibition C. depolarization D. hyperpolarization

back 6

C. depolarization

front 7

Which type of potential does not decay with distance?

A. Graded potential B. Action potential C. Generator potential D. Both a and b

back 7

B. Action potential

front 8

The point at which the all-or-none principle of action potential generation is reached is termed the ________.

A. peak B. depolarization point C. threshold D. point of no return

back 8

C. threshold

front 9

Sodium ion concentration in the cytoplasm of a neuron ________ when its voltage-gated sodium channels open.

A. increases B. decreases C. remains unchanged D. decreases tenfold

back 9

no data

front 10

Depolarization of the neuron refers to __________.

A. a reduction in membrane potential

B. an increase in membrane potential

C. an increased negativity of the neuron interior

D. both b and c

back 10

no data

front 11

During membrane repolarization, there is a decrease in the membrane permeability to which ion?

A. Potassium B. Sodium C. Calcium D. Both potassium and sodium

back 11

no data

front 12

Neurons generally repolarize once the membrane potential reaches approximately +30 mV because __________.

A. voltage-gated sodium channel gates close B. voltage-gated potassium channel gates open C. chemically gated sodium channels open D. voltage-gated calcium channel gates open

back 12

no data

front 13

In an organism, action potentials are propagated unidirectionally toward the axon ending because __________.

A. membranes become nonresponsive due to inactive sodium channels after action potential generation

B. action potentials are always propagated in an anterograde fashion regardless of conditions

C. action potentials cannot start anywhere except at the axon hillock

D. of both a and b

back 13

no data

front 14

Stronger stimuli are interpreted when the CNS receives ________ action potentials.

A. higher magnitude B. more frequent C. lower magnitude D. more infrequent

back 14

no data

front 15

The nodes of Ranvier are found _______.

A. in the CNS only B. on dendrites C. on the neuroglia D. on myelinated axons

back 15

no data

front 16

The location at which a neuron interacts with its target cell (another neuron or a muscle cell or other effector cell) is called the __________.

A. synapse B. junc9on C. connec9on D. axoaxonic target

back 16

no data

front 17

The presynaptic neuron releases neurotransmitters in response to an influx of _______ ions.

A. sodium B. potassium C. calcium D. sodium and potassium

back 17

no data

front 18

Generally speaking, opening chloride channels in the postsynaptic membrane will result in an _______.

A. excitatory postsynaptic potential B. excitatory presynaptic poten9al C. inhibitory postsynaptic potential D. inhibitory presynaptic potential

back 18

no data

front 19

__________ has occurred when a neuron is stimulated by more than one terminal.

A. Temporal summation B. Spatial summation C. Synaptic delay D. Synaptic potentiation

back 19

no data

front 20

A reflex that results from practice is a(n) ______ reflex.

A. intrinsic B. acquired C. autonomic D. skilled

back 20

no data

front 21

Quickly lifting your foot and leg after stepping on a rock is an example of a(n) ________.

A. learned reflex B. intrinsic reflex C. voluntary action D. central program generator

back 21

no data

front 22

The receptors for the stretch reflex are the _________.

A. pain receptors B. muscle spindles C. tendon organs D. touch receptors

back 22

no data