Exercise 20 The Autonomic Nervous System

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1

Sympathetic and parasympathetic fibers serve the same organs and structures. How can they exert opposite effects?

They release different neurotransmitters, which bind to different receptors.

2

Name 3 structures that receive sympathetic but not parasympathetic innervation.

- Adrenal glands
- Arrector pilli muscles
- Sweat glands

3

A pelvic splanchnic nerve contains

preganglionic parasympathetic fibers

4

Sympathetic

- postganglionic fibers secrete norepinephrine; adrenergic fiber

- short preganglionic axon; long postganglionic axon

- arises from spinal nerves T1-L3

- "Fight-or-flight" system

5

Parasympathetic

- postganglionic fibers secrete acetylcholine; cholinergic fiber

- long preganglionic axon; short postganglionic axon

- arises from cranial and sacral nerves

- normally in control

- has more specific control

6

Describe how EDA/GSR can be correlated with activity of the autonomic nervous system.

The autonomic nervous system is integrated by emotions (stress, pain, feelings). These changes change heart, respiration, blood pressure, & more changes occur in the skin. All these can be measured by GSR since it is measurement of changes in skin due to autonomic stimulation.

7

Why might this be an exact tool for testing the sincerity and honesty of a subject?

Its failure rate is far too high to provide the scientific or legal certainty. If it is based on skin and emotional changes, people feel different on different topics/subjects so it could give a false reading.