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PHGY 215-module 2 Questions And Answers With Verified Tests 100% Correct Answers
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  • PHGY 215-module 2

efferent cell body vs. afferent cell body - ️️efferent cell bodies are located within the grey matter of the spinal cord. Afferent cell bodies are located within the dorsal root ganglion Functions of the CNS - ️️nscious regulation of internal environment 2.Emotions 3. voluntary control...

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  • November 15, 2024
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  • 2024/2025
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PHGY 215-module 2
efferent cell body vs. afferent cell body - ✔️✔️efferent cell bodies are located within the
grey matter of the spinal cord. Afferent cell bodies are located within the dorsal root
ganglion

Functions of the CNS - ✔️✔️1.subconscious regulation of internal environment
2.Emotions
3. voluntary control of movement
4.perception
5. higher cognitive functions such as learning and memory

purpose of blood brain barrier being regulated by several components? -
✔️✔️1.dynamic response to the metabolic needs of the neurons and the glial cells
2. regulation of the extracellular matrix
Central Nervous System (CNS) - ✔️✔️consists of the brain and spinal cord

PNS (peripheral nervous system) - ✔️✔️somatic nervous system and autonomic
nervous system

somatic nervous system - ✔️✔️Division of the PNS that controls the body's skeletal
muscles.

autonomic nervous system - ✔️✔️A subdivision of the peripheral nervous system.
Controls involuntary activity of visceral muscles and internal organs and glands.

Function of PNS - ✔️✔️1.communication lines between the CNS and the rest of the
body

afferent neurons - ✔️✔️Nerve cells that carry impulses towards the central nervous
system. SENSORY

efferent neurons - ✔️✔️neurons that take information from the brain to the rest of the
body.
1. somatic or motor neurons
2. Autonomic nervous system
2a. Sympathetic 2b. parasympathetic

afferent neurons are lacking what neuronal processes? - ✔️✔️dendrites

gial cells account for ___% of total cell number in the CNS but only ___% of volume -
✔️✔️90% of total cell number
50% of cellular volume

, 4. main protections of the CNS - ✔️✔️1.Bones of the skull and vertebrae
2. The Pia, arachnoid and dura matter
3. Cerebrospinal fluid
4. blood brain barrier

arachnoid granulations (villi) - ✔️✔️project through dura mater into superior sagittal
sinus, act as one-way valves to control passage of CSF into sinuses

chordid plexus - ✔️✔️1.produces cerebral spinal fluid in each of the 4 ventricles.
2.highly vascularized masses of pia matter that dip into pockets of ependymal cells and
create the CFS
3.

circumventricular organs - ✔️✔️lacks a blood-brain barrier; can monitor chemical
changes in the blood



stretch reflex - ✔️✔️involuntary contraction of a muscle due to rapid stretching of that
muscle

withdrawal reflex - ✔️✔️a spinal reflex that pulls a body part away from a source of
pain

The grey matter of the spinal cord contains - ✔️✔️1. neuronal cell bodies
2. interneurons
3. glial cells

dorsal horn of spinal cord - ✔️✔️cell bodies of interneurons synapsed by afferent
neurons (sensory)

lateral horn of spinal cord - ✔️✔️Contains the cell bodies of the preganglionic ANS
neurons-efferent

ventral horn of spinal cord - ✔️✔️contains the cell bodies of somatic efferent neurons.

SAME/DAVE - ✔️✔️Sensory Afferent Motor Efferent/
Dorsal Afferent Ventral Efferent

dorsal root ganglion - ✔️✔️contains cell bodies of sensory (afferent) neurons


nerve - ✔️✔️A bundle of nerve fibers

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