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ANT 2100 PHYS FINAL EXAM QUESTIONS AND ANSWERS
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ANT 2100 PHYS FINAL EXAM QUESTIONS AND ANSWERS
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ANT 2100 PHYS FINAL EXAMQUESTIONS AND ANSWERS
What are the two divisions of the PNS? - Answers -Somatic and Autonomic Nervous
System
What is the autonomic nervous system broken down into? - Answers -Sympathetic ,
Parasympathetic and Enteric Nervous system
How is information sent to the CNS? - Answers -Sensory Axons
What are the different types of somatic receptors? - Answers -Exteroceptors- sense
change at the bodies surface
Proprioceptors- sense change in skeletal muscles , tendons and body position
What are a few examples of exteroceptors? - Answers -merkel's disks
pacinian corpuscles
free nerve ending
What are some examples of proprioceptors? - Answers -golgi tendon organs
muscle spindles
Frequency of an action potential is proportional to? - Answers -the stimulus intensity
What are phasic receptors? - Answers -receptors that adapt because it is okay for these
receptors to adapt. Many exteroreceptors are phasic receptors
-action potentials slow or cease over time
-example: hat on head
What are tonic receptors? - Answers -Receptors that do not adapt or adapt very little.
-action potentials go unchanged with constant stimuli
-pain receptors and most visceroceptors
Where does the somatic nervous system gather information? And where is this
information then relayed via what nerves? - Answers -The somatic nervous system
gather information from the external environment (receptors) and this information then
relayed to the CNS via sensory nerves
Where are the motor nerves located in the somatic nervous system? - Answers -Brain
stem and all regions of the spinal cord
, What is the effector of the motor output in the somatic nervous system? - Answers -
skeletal muscle
How many efferent motor neurons are between the CNS and the effector of the somatic
nervous system? - Answers -One efferent motor neuron
Describe the efferent motor neurons of the somatic nervous system. - Answers -The
efferent motor neurons of the somatic nervous system are myelinated and cholinergic.
The lower motor neuron releases ACh onto nicotinic receptors on the skeletal muscles
sarcolemma.
The autonomic nervous system gathers stimuli from where? - Answers -the internal
environment via visceroceptors
What nervous system is involuntary and helps maintain homeostasis? - Answers -
Autonomic Nervous System
What are the effectors of motor output from the autonomic nervous system? - Answers -
cardiac muscle
smooth muscle
cells of viscera
How many efferent motor neurons are between the CNS and the effector of the
autonomic nervous system? Describe them - Answers -Two efferent motor neurons
preganglionic motor neurons arise from CNS and are myelinated
postganglionic motor neurons are unmyelinated and synapse with preganglionic and
transmit motor information to effectors
Neuropathy of the autonomic nervous system would cause for - Answers -lack of
autonomic regulation of visceral cells and BP O2 osmolality may not be regulated
DO NOT WANT NEUROPATHY OF VAGUS NERVE
The autonomic nervous system does not get output from what part of the spinal cord -
Answers -cervical spinal cord
When is the sympathetic nervous system most active? - Answers -stressful situations.
"fight or flight"
Where do neurons originate in the CNS for the sympathetic nervous system - Answers -
thoracolumbar division
Describe preganglionic neurons of the sympathetic nervous system - Answers -
Preganglionic axon is short, myelinated and cholinergic. It releases ACh onto a nicotinic
receptor of the postganglionic neuron. The soma originates in the lateral horn
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