28-29

Which type of cell wraps around the axon to form the myelin sheath?

• Schwann cell

• Red blood cell

• Muscle cell

• Bone cell

Which cells are found in either the CNS or the PNS?

• Neurons

• Neuroglial cells

• Muscle cells

• Bone cells

What is the function of astrocytes in the nervous system?

• Provide immune response

• Support and anchor neurons

• Secrete cerebrospinal fluid

• Provide myelin insulation

What is the main function of neuroglia in the peripheral nervous system?

• Transmit nerve impulses

• Support and protect neurons

• Produce hormones

• Regulate blood flow

What is the function of satellite cells in the peripheral nervous system?

• Insulate neurons

• Support and anchor neurons

• Transmit nerve impulses

• Produce hormones

What is the axon covered by?

• Myelin sheath

• Neuroglia

• Schwann cells

• Cerebrospinal fluid

What quickly moves down the length of the neuron during stimulation?

• Resting potential

• Action potential

• Static charge

• Neutral charge

What is the effect of the sodium-potassium pump on the neuron’s resting potential?

• It disrupts it.

• It restores it.

• It has no effect.

• It reverses it.

Tags

NGSS.HS-LS1-3

What is the role of the Na+/K+ pump in nerve impulse transmission?

• Opens Na+ channels

• Restores original voltage levels

• Allows K+ to enter the cell

• Initiates the impulse

What is the threshold voltage for initiating a nerve impulse?

• +40 mV

• 0 mV

• -55 mV

• -70 mV