Nervous System 2

A  FALSE

B  TRUE

A  the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value

B  the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level

C  the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases

D  potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close

E  more sodium ions diffuse into the cell than potassium ions diffuse out of it

A  the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level

B  the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value

C  more sodium ions diffuse into the cell than potassium ions diffuse out of it

D  the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases

E  potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close

A  potassium ions continue to diffuse out of the cell after the inactivation gates of the voltage-gated sodium ion channels begin to close

B  the extra efflux of potassium ions causes the membrane potential to become slightly more positive than the resting value

C  sodium ions diffusing into the cell through ligand-gated channels is greater than potassium ions diffuse out of it

D  the increased potassium ion permeability lasts slightly longer than the time required to bring the membrane potential back to its resting level

E  the inactivation gates of the voltage-gated sodium ion channels begin to open and the diffusion of sodium ions decreases

A  more Na+ diffuses into the cell than K+ diffuses out of it

B  more K+ diffuses out of the cell than Na+ diffuses into it

C  more Na+ diffuses out of the cell than K+ diffuses into it

D  both Na+ and K+ diffuse into the cell

E  more K+ diffuses into the cell than Na+ diffuses out of it

A  TRUE

B  FALSE

A  TRUE

B  FALSE

A  K+ gates open while Na+ gates remain closed.

B  Na+ gates open before K+ gates.

C  K+ gates open before Na+ gates.

D  Na+ gates open while K+ gates remain closed.

E  Na+ and K+ gates open at the same time.

A  The exterior of the cell has a net negative charge and the interior has a net positive charge.

B  The exterior of the cell is neutral and the interior has a net negative charge.

C  The exterior of the cell has a net negative charge and the interior is neutral.

D  The exterior of the cell has a net positive charge and the interior has a net negative charge.

E  The exterior of the cell has a net positive charge and the interior is neutral.

A  Ligand-gated sodium channels open.

B  Synaptic vessels fuse with the plasma membrane and release acetylcholine.

C  Acetylcholine is actively transported from the presynaptic neuron.

D  Acetylcholine is actively transported to the postsynaptic neuron.

E  Sodium ions diffuse into the cell.

A  FALSE

B  TRUE

A  FALSE

B  TRUE

A  Ligand-gated sodium ion channels open and sodium diffuses inward.

B  Voltage-gated sodium ion channels open and sodium diffuses inward.

C  Terminal vessels migrate to the plasma membrane.

D  Ligand-gated calcium ion channels open and calcium diffuses inward.

E  Voltage-gated calcium ion channels open and calcium diffuses inward.

A  voltage-gated sodium ion channels to open, and sodium ions to diffuse into the cell

B  voltage-gated calcium ion channels to open, and calcium ions to diffuse into the cell

C  voltage-gated sodium ion channels to open, and sodium ions to diffuse out of the cell

D  ligand-gated sodium channels to open, and sodium ions to diffuse out of the cell

E  acetylcholine to diffuse into the cell

A  IPSP

B  LTP

C  EPSP

D  NMDA

A  presynaptic inhibition

B  excitotoxicity

C  long-term potentiation

D  long-term depression

A  Endogenous opioids

B  Carbon monoxide

C  ATP

D  Neuropeptide Y

A  Neuropeptide Y

B  ATP

C  Nitric oxide

D  Carbon monoxide

A  Neuropeptide Y

B  ATP

C  Nitric oxide

D  Carbon monoxide

A  ATP

B  Endogenous opioids

C  Endocannabinoids

D  Nitric oxide

A  ATP

B  Carbon monoxide

C  Neuropeptide Y

D  Endogenous opioids

A  ATP

B  Carbon monoxide

C  Endocannabinoids

D  Endogenous opioids

A  It catalyzes reformation of ACh.

B  It catalyzes hydrolysis of ACh to remove it from the synaptic cleft.

C  It binds to sodium channels on the postsynaptic cell.

D  It blocks muscarinic receptors.

A  Specific regions of the brain

B  Skeletal muscle

C  Autonomic ganglia

D  Skeletal muscle, Autonomic ganglia, and Specific regions of the brain

A  Microvilli

B  Tight junctions

C  Desmosomes

D  Gap junctions

A  Produce enzymes to destroy toxic substances

B  Induce tight junctions between capillary endothelial cells

C  Induce tight junctions between capillary endothelial cells,produce enzymes to destroy toxic substances and produce carrier proteins and ion channels

D  Produce carrier proteins and ion channels

A  Ependymal cells

B  Astrocytes

C  Oligodendrocytes

D  Schwann cells

E  Microglia

A  neurons in the CNS lack Schwann cells, which play a major role in axon regeneration

B  he is an adult, and CNS neurons can only regenerate in childhood

C  inhibitory proteins in the PNS will prevent axons in his hand from ever regenerating

D  astrocytes that surround the CNS axons do not have enough myelin for regeneration

A  Sheath of Schwann

B  Nodes of Ranvier

C  Myelin

D  Both neurilemma and sheath of Schwann are correct.

E  Neurilemma