Neuroscience Chapter 5 Quiz

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Questions and Answers

What primarily determines the flux of ions across a membrane?

  • Electrochemical driving force and conductance (correct)
  • Electrical resistance alone
  • Concentration gradient only
  • Only membrane capacitance

What does the Nernst equation help to calculate?

  • Equilibrium potential for specific ions (correct)
  • Graded potential magnitude
  • Resting membrane potential
  • Action potential threshold

What is the primary function of ion channels?

  • To generate resting membrane potential
  • To selectively allow ions to cross the membrane (correct)
  • To store electrical charge
  • To increase electrical resistance

What does resistance in the context of membrane properties refer to?

<p>The relative inability of electrical charges to migrate (B)</p>
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Which statement best describes resting membrane potential?

<p>It represents the electrical charge difference across the membrane at rest. (A)</p>
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What is the primary method by which the brain controls the body?

<p>Electrical signals (B)</p>
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Which part of the nervous system is responsible for voluntary muscle movement?

<p>Somatic nervous system (D)</p>
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What is an action potential?

<p>The brief reversal of membrane potential (D)</p>
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Which system includes both the brain and the spinal cord?

<p>Central nervous system (A)</p>
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What distinguishes organic electrochemical neurons from wire conductors?

<p>Organic neurons involve chemical processes (C)</p>
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Which of the following is NOT a component of the autonomic nervous system?

<p>Central nervous system (D)</p>
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What is the main function of synapses in the nervous system?

<p>To transmit signals between neurons (C)</p>
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What is the role of action potentials in nerve impulses?

<p>They propagate signals along neurons (D)</p>
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What is the primary function of the flocculonodular lobe?

<p>Balance and vestibular function (A)</p>
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Which layer of the cerebellar cortex contains Purkinje cells?

<p>Purkinje cell layer (A)</p>
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What symptom is associated with lesions in the vestibulocerebellum?

<p>Loss of equilibrium (C)</p>
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Which type of fiber is an afferent to the cerebellum?

<p>Mossy fibers (C)</p>
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What motor deficit is characterized by a loss of smooth and coordinated movements?

<p>Ataxia (A)</p>
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What is the primary function of the reticular formation?

<p>Regulation of blood pressure (A)</p>
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Which descending motor pathway specifically controls distal muscles?

<p>Corticospinal tract (B)</p>
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What reflex is responsible for stabilizing gaze during head movement?

<p>Vestibulo-ocular reflex (A)</p>
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The primary motor cortex is associated with which of the following?

<p>Control of voluntary movements (B)</p>
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Which structure is NOT part of the brain stem?

<p>Cerebellum (D)</p>
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What aspect of muscle control do the medial motor pathways primarily oversee?

<p>Control of posture (C)</p>
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Which part of the brain is involved in the preparation for and planning of exercise?

<p>Premotor area (A)</p>
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What is a characteristic function of the ascending reticular activating system?

<p>Arousal and attention (A)</p>
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What is the term used to describe the propagation of action potentials in myelinated fibers?

<p>Saltatory conduction (C)</p>
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Which phase of the action potential is characterized by the influx of sodium ions?

<p>Depolarization (C)</p>
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How is the length constant defined in relation to electrotonic signals?

<p>The distance over which a signal falls to 37% of its initial value (D)</p>
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What does the threshold refer to in the context of action potentials?

<p>The minimum depolarization needed to trigger an action potential (B)</p>
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What kind of receptors are glutamate receptors classified as?

<p>Ionotropic receptors (D)</p>
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What is the characteristic behavior of action potentials described by 'all-or-none'?

<p>They either occur fully or not at all when the threshold is reached (C)</p>
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What property of the cell membrane is represented by the time constant?

<p>The resistance and capacitance of the membrane (D)</p>
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Which process describes the local response conducted to the trigger zone of the neuron?

<p>Electrotonic conduction (B)</p>
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In chemical synapses, what role do neurotransmitters play?

<p>Transmit signals between neurons (B)</p>
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What distinguishes voltage-gated K+ channels from voltage-gated Na+ channels?

<p>K+ channels contribute to repolarization after depolarization (C)</p>
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Flashcards

Ion Flux Determinants

Electrochemical driving force and conductance primarily determine the flux of ions across a membrane.

Nernst Equation Purpose

The Nernst equation calculates the equilibrium potential for specific ions.

Ion Channel Function

Ion channels selectively allow ions to cross the membrane.

Membrane Resistance

Resistance refers to the relative inability of electrical charges to migrate.

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Resting Membrane Potential

Resting membrane potential represents the electrical charge difference across the membrane at rest.

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Brain's Control Method

The brain controls the body primarily through electrical signals.

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Somatic Nervous System

The somatic nervous system is responsible for voluntary muscle movement.

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Action Potential

An action potential is the brief reversal of membrane potential.

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Central Nervous System

The central nervous system includes the brain and the spinal cord.

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Organic Neuron Distinction

Organic neurons involve chemical processes, unlike wire conductors.

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Not Autonomic Nervous System

The central nervous system is NOT a component of the autonomic nervous system

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Synapse Function

Synapses transmit signals between neurons.

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Action Potential Role

Action potentials propagate signals along neurons.

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Flocculonodular Lobe Function

The flocculonodular lobe's primary function is balance and vestibular function.

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Purkinje Cell Layer

The Purkinje cell layer contains Purkinje cells.

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Vestibulocerebellum Lesion Symptom

Lesions in the vestibulocerebellum are associated with a loss of equilibrium.

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Mossy Fibers

Mossy fibers act as an afferent to the cerebellum.

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Ataxia

Ataxia is a motor deficit characterized by a loss of smooth and coordinated movements.

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Reticular Formation

The reticular formation primarily functions in regulation of blood pressure.

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Corticospinal Tract

The corticospinal tract specifically controls distal muscles.

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Vestibulo-ocular Reflex

The vestibulo-ocular reflex is responsible for stabilizing gaze during head movement.

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Primary Motor Cortex

The primary motor cortex is associated with control of voluntary movements.

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Not Brain Stem Component

The cerebellum is not part of the brain stem.

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Medial Motor Pathways

Medial motor pathways primarily oversee posture control.

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Premotor Area

The premotor area is involved in the preparation for and planning of exercise.

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Ascending Reticular Activating System

The ascending reticular activating system is involved with arousal and attention.

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Saltatory Conduction

Saltatory conduction describes the propagation of action potentials in myelinated fibers.

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Depolarization Phase

Depolarization is characterized by the influx of sodium ions.

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Length Constant

The length constant is the distance over which a signal falls to 37% of its initial value.

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Action Potential Threshold

Threshold refers to the minimum depolarization needed to trigger an action potential.

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Glutamate Receptors

Glutamate receptors are classified as ionotropic receptors

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All-or-None Law

Action potentials either occur fully or not at all when the threshold is reached

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Voltage-gated K+ channels

Voltage-gated K+ channels contribute to repolarization after depolarization.

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