APHY 201 Module 02 Nerve Tissue Ivy Tech Questions with Correct Answers
Question 1:
Neuron
Answer:
....an electrically excitable cell that processes and transmits information through electrical and
chemical signals.
Question 2:
Nerve impulse
Answer:
....a signal transmitted along a nerve fiber. It consists of a wave of electrical
depolarization that reverses the potential difference across the nerve cell membranes. It is the
same regardless of the stimulus. aka action potential
Question 3:
Functional Classes of Neurons
Answer:
....Grouped by direction in which nerve impulse travels relative to CNS - Sensory Neurons,
Interneurons, or Motor Neurons.
Question 4:
General Regions of Neurons
Answer:
....Dendrites, Cell Body, and Axon.
Question 5:
Dendrites
Answer:
....Receptive region of the neuron along with the cell body. Receive stimuli from the
environment or from other neurons. Highly branched. Typically covered with ligand-gated ion
channels. Convey incoming messages toward cell body as graded potentials (short distance
signals).
,Question 6:
Cell Body (Perikaryon)
Answer:
....Contains the nucleus and other organelles. Biosynthetic center of neuron that
synthesizes proteins, membranes, and other chemicals. Part of receptive region and can convey
graded potentials to axon hillock due to presence of ligand-gated channels.
Question 7:
Axon
Answer:
....Carries information away from the cell body and toward other cells. Can convey action
potentials due to the presence of voltage-gated channels.
Question 8:
Axon Hillock
Answer:
....Origin of the axon from the cell body.
Question 9:
Initial Segment
Answer:
....This segment of the axon lies distally adjacent to the axon hillock. It is where an action
potential is initiated due to the presence of voltage-gated channels.
Question 10:
Axon Terminals
Answer:
....The axon ends at this terminal, which is also known as synaptic terminals, where the
neuron communicates with other cells. Synaptic vesicles containing neurotransmitter are
present.
Question 11:
Myelin
Answer:
....A membranous wrapping that coats axons and increases the speed of nerve impulse
transmission due to saltatory conduction. Produced by oligodendrocytes in CNS and Schwann
cells in PNS.
, Question 12:
Nodes of Ranvier
Answer:
....The small unmyelinated gaps along the axon that contain voltage-gated channels.
Question 13:
Unmyelinated Axons
Answer:
....These axons lack myelin and utilize continuous conduction.
Question 14:
Basic principles of electricity
Answer:
....Opposite charges attract each other.
Question 15:
If opposite charges are separated, the system has potential energy.
Answer:
Energy is liberated when the charges move toward one another.
Question 16:
Voltage
Answer:
....is a measure of potential energy generated by separated charge. Greater charge difference
between points = higher voltage.
Question 17:
Current
Answer:
....is flow of electrical charge (Ions) between two points that can be used to do work.
Question 18:
Membrane Potential
Answer:
....The unequal charge distribution across the plasma membrane. Measured in millivolts.
Question 1:
Neuron
Answer:
....an electrically excitable cell that processes and transmits information through electrical and
chemical signals.
Question 2:
Nerve impulse
Answer:
....a signal transmitted along a nerve fiber. It consists of a wave of electrical
depolarization that reverses the potential difference across the nerve cell membranes. It is the
same regardless of the stimulus. aka action potential
Question 3:
Functional Classes of Neurons
Answer:
....Grouped by direction in which nerve impulse travels relative to CNS - Sensory Neurons,
Interneurons, or Motor Neurons.
Question 4:
General Regions of Neurons
Answer:
....Dendrites, Cell Body, and Axon.
Question 5:
Dendrites
Answer:
....Receptive region of the neuron along with the cell body. Receive stimuli from the
environment or from other neurons. Highly branched. Typically covered with ligand-gated ion
channels. Convey incoming messages toward cell body as graded potentials (short distance
signals).
,Question 6:
Cell Body (Perikaryon)
Answer:
....Contains the nucleus and other organelles. Biosynthetic center of neuron that
synthesizes proteins, membranes, and other chemicals. Part of receptive region and can convey
graded potentials to axon hillock due to presence of ligand-gated channels.
Question 7:
Axon
Answer:
....Carries information away from the cell body and toward other cells. Can convey action
potentials due to the presence of voltage-gated channels.
Question 8:
Axon Hillock
Answer:
....Origin of the axon from the cell body.
Question 9:
Initial Segment
Answer:
....This segment of the axon lies distally adjacent to the axon hillock. It is where an action
potential is initiated due to the presence of voltage-gated channels.
Question 10:
Axon Terminals
Answer:
....The axon ends at this terminal, which is also known as synaptic terminals, where the
neuron communicates with other cells. Synaptic vesicles containing neurotransmitter are
present.
Question 11:
Myelin
Answer:
....A membranous wrapping that coats axons and increases the speed of nerve impulse
transmission due to saltatory conduction. Produced by oligodendrocytes in CNS and Schwann
cells in PNS.
, Question 12:
Nodes of Ranvier
Answer:
....The small unmyelinated gaps along the axon that contain voltage-gated channels.
Question 13:
Unmyelinated Axons
Answer:
....These axons lack myelin and utilize continuous conduction.
Question 14:
Basic principles of electricity
Answer:
....Opposite charges attract each other.
Question 15:
If opposite charges are separated, the system has potential energy.
Answer:
Energy is liberated when the charges move toward one another.
Question 16:
Voltage
Answer:
....is a measure of potential energy generated by separated charge. Greater charge difference
between points = higher voltage.
Question 17:
Current
Answer:
....is flow of electrical charge (Ions) between two points that can be used to do work.
Question 18:
Membrane Potential
Answer:
....The unequal charge distribution across the plasma membrane. Measured in millivolts.
