1
BIOL 1010 Exam 3 Study Se Questions with Answers
(100% Correct Answers)t
What is the function of the nervous system? Answer: To receive and
process sensory information from both external and internal
environments
The central nervous system (CNS) is made up of what? Answer: The brain
and spinal cord
The peripheral nervous system (PNS) is made up of what? Answer: The
nerves that transmit messages to the CNS (everything but brain/spinal
cord)
What are neurons? Answer: Cells that transmit nerve impulses between
parts of the nervous system
What are neuroglia (glial cells)? Answer: An accessory cell type to
neurons that aid in their functions.
What are some of the jobs of neuroglial cells? Answer: To support and
nourish neurons, maintain homeostasis, form myelin, aid in signal
transmission
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,2
What are the three classes of neurons? Answer: Sensory neurons
Interneurons
Motor neurons
Sensory neurons take messages to where? Answer: The CNS
Interneurons receive ______________ from sensory neurons and/or other
interneurons in the ____. Answer: Information
CNS
Motor neurons take messages _______ from CNS to an organ, muscle
fiber, or gland Answer: Away
What does the cell body of a neuron contain? Answer: Nucleus
What are dendrites? Answer: Extensions that lead TOWARD the cell body
that receive signals from other neurons
What is the axon? Answer: Region of the neuron that conducts nerve
impulses AWAY from the cell body toward other neurons
What is the myelin sheath? Answer: The axonal protective covering
What type of cells form the myelin sheath? Answer: Schwann cells
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, 3
What are nodes of Ranvier? Answer: Gaps where there are no myelin
sheaths
What is a nerve impulse? Answer: The message that a neuron carries and
transmits from one place to another
What are nerve impulses measured in? Answer: Millivolts (mV)
What do millivolts compare? Answer: The differences in electrical
potentials both inside and outside the axon.
What are the 4 phases of nerve impulse transmission? Answer: Resting
potential (-70mV)
Active potential (-55mV)
Depolarization (+35mV)
Repolarization (-70mV)
During resting potential, the inside of the axon is ____________ (+/-)
compared to the outside Answer: Negative
Why is resting potential called resting potential? Answer: Because the
axon is not conducting an impulse
© 2025 All rights reserved
BIOL 1010 Exam 3 Study Se Questions with Answers
(100% Correct Answers)t
What is the function of the nervous system? Answer: To receive and
process sensory information from both external and internal
environments
The central nervous system (CNS) is made up of what? Answer: The brain
and spinal cord
The peripheral nervous system (PNS) is made up of what? Answer: The
nerves that transmit messages to the CNS (everything but brain/spinal
cord)
What are neurons? Answer: Cells that transmit nerve impulses between
parts of the nervous system
What are neuroglia (glial cells)? Answer: An accessory cell type to
neurons that aid in their functions.
What are some of the jobs of neuroglial cells? Answer: To support and
nourish neurons, maintain homeostasis, form myelin, aid in signal
transmission
© 2025 All rights reserved
,2
What are the three classes of neurons? Answer: Sensory neurons
Interneurons
Motor neurons
Sensory neurons take messages to where? Answer: The CNS
Interneurons receive ______________ from sensory neurons and/or other
interneurons in the ____. Answer: Information
CNS
Motor neurons take messages _______ from CNS to an organ, muscle
fiber, or gland Answer: Away
What does the cell body of a neuron contain? Answer: Nucleus
What are dendrites? Answer: Extensions that lead TOWARD the cell body
that receive signals from other neurons
What is the axon? Answer: Region of the neuron that conducts nerve
impulses AWAY from the cell body toward other neurons
What is the myelin sheath? Answer: The axonal protective covering
What type of cells form the myelin sheath? Answer: Schwann cells
© 2025 All rights reserved
, 3
What are nodes of Ranvier? Answer: Gaps where there are no myelin
sheaths
What is a nerve impulse? Answer: The message that a neuron carries and
transmits from one place to another
What are nerve impulses measured in? Answer: Millivolts (mV)
What do millivolts compare? Answer: The differences in electrical
potentials both inside and outside the axon.
What are the 4 phases of nerve impulse transmission? Answer: Resting
potential (-70mV)
Active potential (-55mV)
Depolarization (+35mV)
Repolarization (-70mV)
During resting potential, the inside of the axon is ____________ (+/-)
compared to the outside Answer: Negative
Why is resting potential called resting potential? Answer: Because the
axon is not conducting an impulse
© 2025 All rights reserved
