Flashcards in Chapter 11: The Autonomic Nervous System Deck (17)
What kind of neurons does the somatic nervous system contain?
sensory and motor neurons
What do the somatic neurons receive input from?
receptors of the special and somatic senses.
Somatic motor neurons innervate skeletal muscle to produce what?
conscious, voluntary movements
What is that effect of a motor neuron?
What kind of neurons does the automatic nervous system contain? (ANS)
both autonomic sensory and motor neurons.
The automatic nervous system receives sensory input from what?
somatic senses and special sensory neurons.
What do the automatic nervous system regulate?
visceral activities by either increasing (exciting) or decreasing (inhibiting) the ongoing activities of cardiac muscle, smooth muscle, and the glands.
All autonomic motor pathways consist of two motor neurons in a series. Explain what happens.
1. The axon on the 1st motor neuron of the ANS extends from the central nervous system (CNS) and synapses with the 2nd motor neuron in the ganglion.
2. The 2nd neuron synapses with an effector.
What do preganglionic fibers release?
What do postganglioic fibers release?
acetylcholine or norepinephrine
The output (efferent) component of the ANS is divided into what 2 principal parts?
Sympathetic and Parasympathetic divisions
Organs that receive impulses from both Sympathetic and Parasympathetic fibers are said to have ___________.
The autonomic pathways consist of what 3 linked neurons?
1. Preganglionic neurons (myelinated)
2. Autonomic gangion ( a collection of nerve cell bodies)
3. Postganglionic neurons (unmyelinated)
The motor (output) side of the autonomic system consists of what 2 divisions?
1. Sympathetic division
2. Parasympathetic division
Autonomic neurons are classified on the basis of the neurotransmitter they release. What are the 2 types of neurons, what do they release and what are their effect?
-effects are short-lived and localized
-effects are long-lasting and widespread
What is the sympathetic response?
'fight or flight'