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

Answer 1

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. "

• True - Correct

17) Which neuron would stimulate a muscle contraction?

• Multipolar
• Unipolar
• Bipolar

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

• Multipolar
• Unipolar - Correct Answer
• Bipolar

19) Which neuron is never myelinated?

• Multipolar
• Unipolar
• Bipolar - Correct Answer

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

• Multipolar - Correct Answer
• Unipolar
• Bipolar

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.

• False - Correct Option

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

• True - Correct Option

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

• False - Correct Option

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

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

• True - Correct Option

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 - Correct Option
• False

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

• True - Correct Option

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

• True
• False

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

• False - Correct Option

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

• True - Correct Option

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

• False - Correct Option

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

• astrocytes; neurolemmocytes (Schwann cells)
• oligodendrocytes; neurolemmocytes (Schwann cells) - Correct Option
• microglia; satellite cells
• ependymal cells; satellite cells

33) Which glial cells behave much like certain leukocytes?

• microglia - Correct Option
• ependymal cells
• oligodendrocyte
• satellite cells

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

• oligodendrocytes; Schwann cells
• saltatory; action potentials
• continuous; saltatory - Correct Option
• saltatory; continuous

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

• changes in voltage
• movement of ions
• both a and b - Correct Option
• neither a nor b

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

• neurotransmitters; postsynaptic
• receptor proteins; postsynaptic - Correct Option
• ligand-gated channels; presynaptic
• receptor proteins; presynaptic

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

• somatic; visceral
• somatic; peripheral
• autonomic; somatic - Correct Option
• central; peripheral

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.

• ascorbic acid (vitamin C); neuritis and demyelination
• folic acid (folate); anencephaly and spina bifida - Correct Option
• pantothenic acid; amyotrophic lateral sclerosis
• iron; Guillain-Barr syndrome

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.

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

• Pons
• Septum pellucidum
• Corpus callosum - Correct Option
• Thalamus