Action Potentials, Neurons, and Neurotransmitters

In the CNS, a neuron typically receives information from other neurons at its

• axon

• dendrites

• Nissl bodies

• nucleus

Neuroglia responsible for maintaining the blood-brain barrier are the

• microglia

• ependymal cells

• astrocytes

• oligodendrocytes

The neural cells responsible for the analysis of sensory inputs and coordination of motor outputs are

• neuroglia

• interneurons

• sensory neurons

• motor neurons

Depolarization of a neuron cell membrane will shift the membrane potential toward

• 0 mV

• -70 mV

• -90 mV

• a, b, and c are correct

Tags

NGSS.HS-LS1-3

The primary determinant of the resting membrane potential is

• the membrane permeability to sodium

• the membrane permeability to potassium

• intracellular negatively charged proteins

• negatively charged chloride ions in the ECF

Action potentials vary in strength, depending on the intensity of the initial stimulus

• True

• False

A neuron that is brought closer to threshold is considered to be

• facilitated

• inhibited

• fatigued

• enabled

If the resting membrane potential is -70 mV and the threshold is -55 mV, a membrane potential of -60 mV will

• produce an action potential

• make it easier to produce an action potential

• make it harder to produce an action potential

• hyperpolarize the membrane

A graded potential

• decreases with distance from the point of stimulation

• spreads passively because of local currents

• may involve wither depolarization or hyperpolarization

• a, b, and c are correct

For an action potential to begin, an area of excitable membrane must

• have its voltage-regulated gates inactivated

• be hyperpolarized

• be depolarized to threshold level

• not be in a relative refractory period