PHYL 141 Exam 3 || 100% Verified Answers.
CNS (Central Nervous System) correct answers Consists of the brain and spinal cord, which
primarily interpret incoming sensory information and issue instructions based on that
information and on past experience
PNS (Peripheral Nervous System) correct answers Consists of the cranial and spinal nerves,
ganglia, and sensory receptors
2 Major Subdivisions of PNS correct answers Sensory Portion and Motor Portion
Sensory Portion correct answers Which consists of nerve fibers that conduct impulses from
sensory receptors toward the CNS
Motor Portion correct answers Which contains nerve fibers that conduct impulses away from the
CNS
Neuron (Nerve cells) correct answers The basic functional units of nervous tissue. Highly
specialized to transmit messages from one part of the body to another in the form of nerve
impulses
Ganglia correct answers In the PNS, clusters of neuron cell bodies
Neuroglia correct answers Glial cells, of the CNS include astrocytes, oligodendrocytes,
microglial cells, and ependymal cells. Found in the PNS is Shwann cells, also known as
neurolemmocytes, and satellite cells.
Astrocytes correct answers are the most abundant CNS neuroglia
Oligodendrocytes correct answers Have processes that form myelin sheaths around CNS axons
Microglial cells correct answers are defensive cells in the CNS
Ependymal cell correct answers Line cerebrospinal fluid filled cavities
Schwann cells/ Satellite cells correct answers Which form myelin, surround neurons in the PNS
Unipolar Neurons correct answers One very short process, divides into peripheral and Central
Processes
Pseudo unipolar neurons correct answers derived from bipolar neurons
Bipolar neurons correct answers two processes attached to the cell body, quite rare
Multipolar neurons correct answers Processes from cell body that are classified as dendrites,
carries impulses away from CNS (neurons un brain and spinal cord)
, Afferent (Sensory) neurons correct answers Neurons carrying impulses from sensory receptors in
viscera to the CNS (towards the Brain)
Efferent (motor) neurons correct answers Neurons carrying impulses from the CNS to the viscera
and/or body muscles and glands (away from brain)
Sensory correct answers Contains nerve fibers that conduct impulses from sensory receptors
TOWARD CNS
Motor correct answers Contains nerve fibers that conduct impulses AWAY FROM CNS
Interneurons correct answers Which are situated between and contribute to pathways that
connect sensory and motor neurons
Mixed nerves correct answers Most nerves of the body, including all spinal nerves, are mixed
nerves
Neural tube correct answers The embryonic structure that ultimately forms the brain and spinal
cord
Autonomic Reflex (Visceral) correct answers Mediated through the Autonomic nervous system
(ANS)
Somatic correct answers Stimulate skeletal muscles by the somatic divisions
5 components of reflex arc correct answers 1. Receptor
2. Sensory Neuron
3. Integration Center
4. Motor Neuron
5. Effector
Stretch reflexes correct answers Deep tendons
Reciprocal Inhibition correct answers Causes them to relax and prevents them from resisting (or
reversing) the contraction of the stretched muscle
Monosynaptic Reflex and Polysynaptic Reflex correct answers The integration center is in the
spinal cord, and in each example the receptor and effector are in the same limb. The patellar
reflex, a two neuron monosynaptic reflex. A flexor reflex, an example of a polysynaptic reflex
Accessory Structure of eye correct answers Eyebrows, eyelids, conjunctivae, lacrimal apparatus,
extrinsic eye muscles
Extrinsic eye muscles correct answers Lateral Rectus
Medial Rectus
CNS (Central Nervous System) correct answers Consists of the brain and spinal cord, which
primarily interpret incoming sensory information and issue instructions based on that
information and on past experience
PNS (Peripheral Nervous System) correct answers Consists of the cranial and spinal nerves,
ganglia, and sensory receptors
2 Major Subdivisions of PNS correct answers Sensory Portion and Motor Portion
Sensory Portion correct answers Which consists of nerve fibers that conduct impulses from
sensory receptors toward the CNS
Motor Portion correct answers Which contains nerve fibers that conduct impulses away from the
CNS
Neuron (Nerve cells) correct answers The basic functional units of nervous tissue. Highly
specialized to transmit messages from one part of the body to another in the form of nerve
impulses
Ganglia correct answers In the PNS, clusters of neuron cell bodies
Neuroglia correct answers Glial cells, of the CNS include astrocytes, oligodendrocytes,
microglial cells, and ependymal cells. Found in the PNS is Shwann cells, also known as
neurolemmocytes, and satellite cells.
Astrocytes correct answers are the most abundant CNS neuroglia
Oligodendrocytes correct answers Have processes that form myelin sheaths around CNS axons
Microglial cells correct answers are defensive cells in the CNS
Ependymal cell correct answers Line cerebrospinal fluid filled cavities
Schwann cells/ Satellite cells correct answers Which form myelin, surround neurons in the PNS
Unipolar Neurons correct answers One very short process, divides into peripheral and Central
Processes
Pseudo unipolar neurons correct answers derived from bipolar neurons
Bipolar neurons correct answers two processes attached to the cell body, quite rare
Multipolar neurons correct answers Processes from cell body that are classified as dendrites,
carries impulses away from CNS (neurons un brain and spinal cord)
, Afferent (Sensory) neurons correct answers Neurons carrying impulses from sensory receptors in
viscera to the CNS (towards the Brain)
Efferent (motor) neurons correct answers Neurons carrying impulses from the CNS to the viscera
and/or body muscles and glands (away from brain)
Sensory correct answers Contains nerve fibers that conduct impulses from sensory receptors
TOWARD CNS
Motor correct answers Contains nerve fibers that conduct impulses AWAY FROM CNS
Interneurons correct answers Which are situated between and contribute to pathways that
connect sensory and motor neurons
Mixed nerves correct answers Most nerves of the body, including all spinal nerves, are mixed
nerves
Neural tube correct answers The embryonic structure that ultimately forms the brain and spinal
cord
Autonomic Reflex (Visceral) correct answers Mediated through the Autonomic nervous system
(ANS)
Somatic correct answers Stimulate skeletal muscles by the somatic divisions
5 components of reflex arc correct answers 1. Receptor
2. Sensory Neuron
3. Integration Center
4. Motor Neuron
5. Effector
Stretch reflexes correct answers Deep tendons
Reciprocal Inhibition correct answers Causes them to relax and prevents them from resisting (or
reversing) the contraction of the stretched muscle
Monosynaptic Reflex and Polysynaptic Reflex correct answers The integration center is in the
spinal cord, and in each example the receptor and effector are in the same limb. The patellar
reflex, a two neuron monosynaptic reflex. A flexor reflex, an example of a polysynaptic reflex
Accessory Structure of eye correct answers Eyebrows, eyelids, conjunctivae, lacrimal apparatus,
extrinsic eye muscles
Extrinsic eye muscles correct answers Lateral Rectus
Medial Rectus
