Obj. 2: Compare ANS vs Somatic Nervous System Flashcards
In what 3 ways does the ANS differ frm the somatic nervous system?
- Effectors
- Efferent pathways
- Target organ responses (based on neurotransmitter effects)
How doe the effectors differ between the ANS and somatic nervous system?
- Effectors of the somatic nervous system are skeletal muscles
- Effectors of the ANS are cardiac muscle, smooth muscle, and glands
In which system are the effectors skeletal muscles?
In the somatic nervous system
In which system are the effectors cardiac muscle, smooth muscle, and glands?
In the ANS
In which system are the efferent pathways thick, heavily myelinated axons (cranial nerves or spinal nerves) that extend from their CNS cell body to the effector muscle (single neuron chain)?
Somatic motor neurons
In which system are efferent pathways axons in a two-neuron chain?
In the ANS
describe the axon in the preganglionic (first) neuron of the ANS two-neuron chain
It is locatedin the CNS and has a lightly myelinated axon
describe axon of the ganglionic (second) neuron in the ANS two-neuron chain
it is located outside the CNS and its unmyelinated post-ganglionic axon
extends to an effector organ
Neurotransmitter effects: What do all somatic motor neurons release?
all somatic motor neurons release Acetylcholine (ACh)
Neurotransmitter effects:
What is the effect of the release of Acetylcholine (ACh) at the neuromuscular junction?
The release of Acetylcholine (ACh) at the neuromuscular junction always has an
excitatory effect
Neurotransmitter effects:
What preganglionic fibers release?
Preganglionic fibers release ACh
Neurotransmitter effects:
What do postganglionic fibers release?
postganglionic fibers release norepinephrine (NE) (sympathetic) or ACh (parasympathetic)
Neurotransmitter effects:
What is the effect of norepinephrine (NE) or ACh on postganglionic fibers in the ANS?
The effect of norepinephrine (NE) or ACh on postganglionic fibers is either
stimulatory or inhibitory
Neurotransmitter effects:
ANS effect on the target organ is dependent upon what factors?
ANS effect on the target organ is dependent upon the neurotransmitter released
and the receptor type of the effector