Chapter 15: The Autonomic Nervous System Flashcards
True or false?
Both SNS and ANS include both sensory and motor neurons.
True. Both SNS and ANS include both sensory and motor neurons.
Both SNS and ANS are part of the central/peripheral nervous system.
Both SNS and ANS are part of the peripheral nervous system.
True or false?
SNS stimulation either excites or inhibits its effectors.
False. SNS stimulation always excites its effectors.
True or false?
ANS stimulation always excites visceral effectors.
False. ANS stimulation either excites or inhibits its effectors.
SNS/ANS controls contraction of skeletal muscles.
SNS controls contraction of skeletal muscles.
SNS/ANS controls contraction of smooth muscle, cardiac muscle, and glands.
ANS
Most ANS responses can/cannot be consciously altered to any great degree.
Cannot.
True or false?
Dilation and constriction of blood vessels is an example of autonomic motor response.
True.
Four examples of autonomic motor responses are:
Dilation and constriction of blood vessels, adjustment of heart rate, dilation of the pupils, adjustment of breathing rate.
The axons of somatic/autonomic motor neurons extend from the central nervous system directly with the effector.
Somatic
Most somatic/autonomic motor pathways consist of two motor neurons in series, with the first motor neuron as a preganglionic/postganglionic neuron and the second neuron as a preganglionic/postganglionic neuron.
Automatic, preganglionic, postganglionic.
Most sympathetic/parasympathetic postganglionic neuron’s are adrenergenic.
Sympathetic.
Define agonist.
A substance that bindings and activates a receptor, which is a process that mimics the effect of a neurotransmitter or hormone.
Define antagonist.
A substance that binds to you and blocks a receptor preventing a neurotransmitter or hormone from exerting its effect.
When an antagonist binds to a neurotransmitter receptor, the normal action of the neurotransmitter will be blocked/enhanced/mimicked/unaffected.
Blocked.
