\" In a synapse between two neurons, a postsynaptic potential is a graded potent

Question

" In a synapse between two neurons, a postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synaptic cleft. "

True

False

QUESTION 17

Which neuron would stimulate a muscle contraction?

Multipolar

Unipolar

Bipolar

QUESTION 18

Which neuron is a sensory neuron found in a reflex arc?

Multipolar

Unipolar

Bipolar

QUESTION 19

Which neuron is never myelinated?

Multipolar

Unipolar

Bipolar

QUESTION 20

" In a reflex arc, which neuron has its cell body inside the spinal cord?"

Multipolar

Unipolar

Bipolar

QUESTION 21

The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.

True

False

QUESTION 22

Neurons in the CNS are organized into functional groups.

True

False

QUESTION 23

Strong stimuli cause the amplitude of action potentials generated to increase.

True

False

QUESTION 24

In myelinated axons the charge propagation through the myelinated internodal regions occurs via passive charge diffusion only and the signal degrades over distance.

True

False

QUESTION 25

A single postsynaptic potential in a neuron not usually large enough to trigger an action potential.

True

False

QUESTION 26

" An action potential traveling toward a synapse opens calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane."

True

False

QUESTION 27

Axon diameter and degree of myelination determine nerve impulse conduction velocity.

True

False

QUESTION 28

"If the membrane potential at the axon hillock of the postsynaptic neuron reaches threshold level, an action potential will be produced."

True

False

QUESTION 29

Acetylcholine is actively transported from the pre-synaptic membrane to the post - synaptic membrane.

True

False

QUESTION 30

The area between the pre-synaptic nerve cell and the post-synaptic muscle cell is termed the synaptic cleft.

True

False

QUESTION 31

Receptors on the post-synaptic cell membrane that bind the neurotransmitter are voltage-gated.

True

False

QUESTION 32

"Their methods are different, but ____________ in the CNS and ____________ in the PNS perform similar functions."

astrocytes; neurolemmocytes (Schwann cells)

oligodendrocytes; neurolemmocytes (Schwann cells)

microglia; satellite cells

ependymal cells; satellite cells

QUESTION 33

Which glial cells behave much like certain leukocytes?

microglia

ependymal cells

oligodendrocytes

satellite cells

QUESTION 34

In terms of nerve impulse conduction, unmyelinated is to ____________ as myelinated is to ____________.

oligodendrocytes; Schwann cells

saltatory; action potentials

continuous; saltatory

saltatory; continuous

QUESTION 35

An action potential involves ____________ across a neuron's plasma membrane.

changes in voltage

movement of ions

both a and b

neither a nor b

QUESTION 36

"At a chemical synapse, ____________ are found only in the plasma membrane of the ____________ cell."

neurotransmitters; postsynaptic

receptor proteins; postsynaptic

ligand-gated channels; presynaptic

receptor proteins; presynaptic

QUESTION 37

With regard to control of muscle cells and glands, ____________ is to involuntary as ____________ is to voluntary.

somatic; visceral

somatic; peripheral

autonomic; somatic

central; peripheral

QUESTION 38

Increased dietary intake of vitamin B12Êand ____________ during pregnancy can dramatically reduce the incidence of neural tube defects such as ____________.

ascorbic acid (vitamin C); neuritis and demyelination

folic acid (folate); anencephaly and spina bifida

pantothenic acid; amyotrophic lateral sclerosis

iron; Guillain-Barr syndrome

QUESTION 39

Which statement about synapses between neurons is FALSE?

An excitatory postsynaptic potential occurs if the binding of the neurotransmitter to its receptor causes Na+ channels to open.

If the excitatory and inhibitory effects are equal this will trigger an action potential at the axon hillock of the postsynaptic neuron.

In an inhibitory postsynaptic potential the postsynaptic membrane becomes hyperpolarized.

An inhibitory postsynaptic potential occurs if the binding of the neurotransmitter to its receptor causes K+ channels to open.

QUESTION 40

The region of the brain containing commissural fibers crossing between the right and left cerebral hemispheres is the _________.

Pons

Septum pellucidum

Corpus callosum

Thalamus

Multipolar

Unipolar

Bipolar

Explanation / Answer

Answer:

16) In a synapse between two neurons, a postsynaptic potential is a graded potential that is the result of a neurotransmitter released into the synaptic cleft. "

17) Which neuron would stimulate a muscle contraction?

18) Which neuron is a sensory neuron found in a reflex arc?

19) Which neuron is never myelinated?

20) " In a reflex arc, which neuron has its cell body inside the spinal cord?"

21) The all-or-none phenomenon as applied to nerve conduction states that the whole nerve cell must be stimulated for conduction to take place.

22) Neurons in the CNS are organized into functional groups.

23) Strong stimuli cause the amplitude of action potentials generated to increase.

24) In myelinated axons the charge propagation through the myelinated internodal regions occurs via passive charge diffusion only and the signal degrades over distance.

25) A single postsynaptic potential in a neuron not usually large enough to trigger an action potential.

26) " An action potential traveling toward a synapse opens calcium ion channels at the presynaptic end, which in turn promotes fusion of synaptic vesicles to the axonal membrane."

27) Axon diameter and degree of myelination determine nerve impulse conduction velocity.

28) "If the membrane potential at the axon hillock of the postsynaptic neuron reaches threshold level, an action potential will be produced."

29) Acetylcholine is actively transported from the pre-synaptic membrane to the post - synaptic membrane.

30) The area between the pre-synaptic nerve cell and the post-synaptic muscle cell is termed the synaptic cleft.

31) Receptors on the post-synaptic cell membrane that bind the neurotransmitter are voltage-gated.

32) "Their methods are different, but oligodendrocytes; in the CNS and neurolemmocytes in the PNS perform similar functions."

33) Which glial cells behave much like certain leukocytes?

34) In terms of nerve impulse conduction, unmyelinated is to continuous as myelinated is to saltatory.

35) An action potential involves ____________ across a neuron's plasma membrane.

36) "At a chemical synapse,receptor proteins are found only in the plasma membrane of the postsynaptic cell."

37) With regard to control of muscle cells and glands, autonomic is to involuntary as somatic is to voluntary.

38) Increased dietary intake of vitamin B12 Êand folic acid (folate) during pregnancy can dramatically reduce the incidence of neural tube defects such as anencephaly and spina bifida.

39) Which statement about synapses between neurons is FALSE?

40) The region of the brain containing commissural fibers crossing between the right and left cerebral hemispheres is the Corpus callosum.

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