Intro to Nervous System

A ___________ makes an action potential less likely to occur and makes the inside of the neuron more _________.

• Depolarization ; positive

• Depolarization ; negative

• Hyperpolarization ; positive

• Hyperpolarization ; negative

Which type of neuroglial cells forms the blood-brain barrier?

• Astrocytes

• Microglia

• Ependymal cells

• Oligodendrocytes

_____________ are neuroglia that myelinate axons in the CNS, and ______________ are neuroglia that myelinate axons in the PNS.

• Oligodendrocytes ; satellite cells

• Oligodendrocytes ; Schwann cells

• Schwann cells ; oligodendrocytes

• Schwann cells ; satellite cells

• Astrocytes ; oligodendrocytes

What is the resting membrane potential of the inside of a neuron?

• +50 mV

• 0 mV

• -55 mV

• -70 mV

Which ions have a positive charge? Select all that apply!

• Na (sodium)

• Ca (calcium)

• Cl (chlorine)

• K (potassium)

Tags

NGSS.HS-PS1-1

The sodium-potassium pump moves ______ sodium ions _____ the neuron.

• 3 ; into

• 3 ; out of

• 2 ; into

• 2 ; out of

Tags

NGSS.HS-LS1-3

The sodium-potassium pump moves ______ potassium ions _____ the neuron.

• 3 ; into

• 3 ; out of

• 2 ; into

• 2 ; out of

Tags

NGSS.HS-LS1-3

What happens when a stimulus brings a neuron to the threshold voltage? Select all that apply!

• It hyperpolarizes

• It fires an action potential

• Potassium ions flow into the neuron

• Sodium ions flow into the neuron

The inside of the neuron is more __________ than the outside.

• Negative

• Positive

Tags

NGSS.HS-PS2-5

Most sensory neurons are _________.

• Unipolar

• Bipolar

• Tripolar

• Multipolar