ATI RN
Nervous System Multiple Choice Questions and Answers Questions
Question 1 of 5
Cholinergic-blocking agents have as an unwanted side effect:
Correct Answer: D
Rationale: Cholinergic blockers (e.g., atropine) inhibit parasympathetic effects, causing dry mouth (reduced salivation). Other options are parasympathetic effects.
Question 2 of 5
Which kind of neuroglial cells are not found in the CNS?
Correct Answer: D
Rationale: Satellite cells are found in the peripheral nervous system (PNS), supporting neuron cell bodies in ganglia. All others (astrocytes, ependymal cells, microglia, oligodendrocytes) are CNS glial cells.
Question 3 of 5
In a resting neuron, the:
Correct Answer: B
Rationale: At rest (~-70 mV), the neuron’s outside is positively charged (more Na⁺) and inside negatively charged (more K⁺), creating a potential difference. The membrane has selective permeability.
Question 4 of 5
The arrival on a given neuron of a series of impulses from a series of terminal axons, resulting in an action potential, is an example of:
Correct Answer: D
Rationale: Spatial summation occurs when multiple presynaptic inputs (from different axons) collectively depolarize a neuron to threshold, triggering an action potential. Temporal summation involves rapid single-source inputs.
Question 5 of 5
The general depolarization toward threshold of a cell membrane when excitatory synaptic activities predominate is known as:
Correct Answer: D
Rationale: Facilitation is the process where excitatory inputs depolarize a neuron toward threshold, enhancing the likelihood of an action potential. ‘Facultation’ is a typo.