A and P Quiz

chemically regulated sodium channels are open and sodium is diffusing into the cell.

A postsynaptic neuron will have an excitatory postsynaptic potential (EPSP) when the neuron is hyperpolarized. more calcium ions than usual diffuse into the neuron. chemically regulated potassium channels are open and potassium is diffusing out of the cell. more potassium ions than usual diffuse out of the neuron. chemically regulated sodium channels are open and sodium is diffusing into the cell.

loss of sensation in his torso

Bill contracts a viral disease that destroys cells in the posterior gray horns in his spinal cord. As a result, which of the following would you expect? problems with moving his arms loss of sensation in his torso uncontrollable sweating of his feet problems moving his legs inability to breathe

are local hyperpolarizations

IPSPs (inhibitory postsynaptic potentials) IPSPs (inhibitory postsynaptic potentials) are local hyperpolarizations. increase membrane permeability to sodium ions. block the efflux of calcium ions. block the efflux of potassium ions. are local depolarizations.

spatial summation

Summation that results from the cumulative effect of multiple synapses at multiple places on the neuron is designated temporal summation. inhibition of the impulse. spatial summation. impulse transmission. hyperpolarization.

axon of motor neurons

The anterior root of a spinal nerve contains interneurons. axons of motor neurons. cell bodies of sensory neurons. axons of sensory neurons. cell bodies of motor neurons.

EPSPs

The neurotransmitter glutamate opens channels that are permeable to sodium ions. What effect does glutamate produce on a postsynaptic neuron? (ch12) both IPSPs and EPSPs IPSPs neither IPSPs nor EPSPs EPSPs

nitric oxide

Which of the following neurotransmitters is a dissolved gas? nitric oxide aspartate histamine glutamate serotonin