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EXSS 175 Exam 2 The Nervous System Questions and Answers (100% Pass)
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EXSS 175 Exam 2 The Nervous System Questions and Answers (100% Pass)
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©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AMEXSS 175 Exam 2 The Nervous System
Questions and Answers (100% Pass)
functions of the nervous system - ✔️✔️-sensory (senses change in environment)
-integrative (analyzes data, stores data, decides which stimuli are important)
-motor (responds to stimuli)
two principle divisions of the NS - ✔️✔️-central nervous system (CNS)
-peripheral nervous system (PNS)
central nervous system (CNS) - ✔️✔️-brain: lies above foramen magnum
-spinal cord: lies below foramen magnum
peripheral nervous system (PNS) - ✔️✔️-cranial nerves
-spinal nerves
-peripheral nerves
functional classification of neurons - ✔️✔️-afferent (sensory) neuron
-efferent (motor) neurons
-interneurons (association neurons)
afferent neurons - ✔️✔️sensory
efferent neurons - ✔️✔️motor
interneurons - ✔️✔️association neurons
3 components of the neuron - ✔️✔️-dendrites
-cell body (soma)
-axon
dendrite - ✔️✔️-input to neuron
-branched processes from cell body
-function:
--nerve impulses "toward" cell body
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, ©PREP4EXAMS @2024 [REAL EXAM DUMPS] Wednesday, July 17, 2024 1:27 AM
--relay info from external environment
-several per neuron
axon - ✔️✔️-long, thin, cylinder
-axon-hillock: where it joins cell body
-function: transmit nerve impulses
-communicates with other cells via axon terminals
axon terminals - ✔️✔️-synaptic end bulb
--synaptic vesicle
--neurotransmitter
synapses - ✔️✔️junction b/w two neurons or b/w neuron and effector (muscle, organ, or gland)
myelination - ✔️✔️-myelin sheath
--insulates axon
--increases nerve conduction velocity
--schwann cells
-nodes of ranvier
degrees of myelination - ✔️✔️-types
--A-alpha
--A-beta
--A-delta
--C
A-alpha - ✔️✔️(degrees of myelination)
-large, myelinated, fast transmission (motor)
A-beta - ✔️✔️(degrees of myelination)
-large, myelinated, fast, respond to touch
A-delta - ✔️✔️(degrees of myelination)
-small, slow, lightly myelinated, respond to pain and temp.
C - ✔️✔️(degrees of myelination)
-very small, very slow, unmyelinated, respond to pain
multiple sclerosis (MS) - ✔️✔️-myelin sheath deteriorates
--sensory or motor neurons
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