Obj. 2: Compare ANS vs Somatic Nervous System Flashcards

1
Q

In what 3 ways does the ANS differ frm the somatic nervous system?

A
  • Effectors
  • Efferent pathways
  • Target organ responses (based on neurotransmitter effects)
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2
Q

How doe the effectors differ between the ANS and somatic nervous system?

A
  • Effectors of the somatic nervous system are skeletal muscles
  • Effectors of the ANS are cardiac muscle, smooth muscle, and glands
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3
Q

In which system are the effectors skeletal muscles?

A

In the somatic nervous system

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4
Q

In which system are the effectors cardiac muscle, smooth muscle, and glands?

A

In the ANS

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5
Q

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)?

A

Somatic motor neurons

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6
Q

In which system are efferent pathways axons in a two-neuron chain?

A

In the ANS

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7
Q

describe the axon in the preganglionic (first) neuron of the ANS two-neuron chain

A

It is locatedin the CNS and has a lightly myelinated axon

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8
Q

describe axon of the ganglionic (second) neuron in the ANS two-neuron chain

A

it is located outside the CNS and its unmyelinated post-ganglionic axon

extends to an effector organ

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9
Q

Neurotransmitter effects: What do all somatic motor neurons release?

A

all somatic motor neurons release Acetylcholine (ACh)

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10
Q

Neurotransmitter effects:

What is the effect of the release of Acetylcholine (ACh) at the neuromuscular junction?

A

The release of Acetylcholine (ACh) at the neuromuscular junction always has an

excitatory effect

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11
Q

Neurotransmitter effects:

What preganglionic fibers release?

A

Preganglionic fibers release ACh

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12
Q

Neurotransmitter effects:

What do postganglionic fibers release?

A

postganglionic fibers release norepinephrine (NE) (sympathetic) or ACh (parasympathetic)

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13
Q

Neurotransmitter effects:

What is the effect of norepinephrine (NE) or ACh on postganglionic fibers in the ANS?

A

The effect of norepinephrine (NE) or ACh on postganglionic fibers is either

stimulatory or inhibitory

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14
Q

Neurotransmitter effects:

ANS effect on the target organ is dependent upon what factors?

A

ANS effect on the target organ is dependent upon the neurotransmitter released

and the receptor type of the effector

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15
Q
A
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