Nervous System RPA Exam Questions and Answers Already Passed Latest Update 2025-2026
What channels are primarily found at regions called Nodes of Ranvier? - AnswersVoltage-gated
K+ channels, Voltage-gated Na+ channels
What best describes a voltage-gated Na+ channel? - Answers- Opened by charge
- Gated
The vagus nerve releases acetylcholine neurotransmitters resulting in an increased heart rate. -
AnswersFalse - Acetylcholine decreases the heart rate. It binds to muscarinic receptors on
pacemaker cells at the sinoatrial and atrioventricular nodes.
At what voltage would the intracellular concentration of Na+ exceed the extracellular
concentration? - AnswersNone of these voltages. Na+ inside the cell never exceeds the
concentration outside the cell.
K+ carries positive charge into the cell and Na+ carries positive charge out of the cell -
AnswersFalse - K+ positive out of the cell, Na+ positive into cell
What ion is responsible for establishing an electrical equilibrium with K+ and prevents too much
K+ from leaving the cell? - Answerslarge impermeant anions
Voltage and membrane resistance are inversely proportional to each other.
(V= IR) - AnswersFalse
They are proportional to each other. If V increases, so does R.
What are the functions of astrocytes? - Answers- Surround the synaptic cleft between neurons
- Clear out excess amounts of neurotransmitters
- Regulate extracellular K+ concentrations
Input - AnswersDendrites and cell body
conductile - AnswersAxon
Output - AnswersAxon Terminal
Input (Function) - AnswersSensory info from outside world carried from PNS to CNS
Processing - AnswersIntegration of sensory signals in the CNS
Output - AnswersMotor info to take action carried from the CNS to the PNS
What channels are primarily found at regions called Nodes of Ranvier? - AnswersVoltage-gated
K+ channels, Voltage-gated Na+ channels
What best describes a voltage-gated Na+ channel? - Answers- Opened by charge
- Gated
The vagus nerve releases acetylcholine neurotransmitters resulting in an increased heart rate. -
AnswersFalse - Acetylcholine decreases the heart rate. It binds to muscarinic receptors on
pacemaker cells at the sinoatrial and atrioventricular nodes.
At what voltage would the intracellular concentration of Na+ exceed the extracellular
concentration? - AnswersNone of these voltages. Na+ inside the cell never exceeds the
concentration outside the cell.
K+ carries positive charge into the cell and Na+ carries positive charge out of the cell -
AnswersFalse - K+ positive out of the cell, Na+ positive into cell
What ion is responsible for establishing an electrical equilibrium with K+ and prevents too much
K+ from leaving the cell? - Answerslarge impermeant anions
Voltage and membrane resistance are inversely proportional to each other.
(V= IR) - AnswersFalse
They are proportional to each other. If V increases, so does R.
What are the functions of astrocytes? - Answers- Surround the synaptic cleft between neurons
- Clear out excess amounts of neurotransmitters
- Regulate extracellular K+ concentrations
Input - AnswersDendrites and cell body
conductile - AnswersAxon
Output - AnswersAxon Terminal
Input (Function) - AnswersSensory info from outside world carried from PNS to CNS
Processing - AnswersIntegration of sensory signals in the CNS
Output - AnswersMotor info to take action carried from the CNS to the PNS
