Autonomic nervous system Flashcards Preview

Anatomy and Physiology > Autonomic nervous system > Flashcards

Flashcards in Autonomic nervous system Deck (13):
1

Describe the general structure of the autonomic portion of the nervous system

-It is part of the peripheral nervous system

-generally involving a preganglionic neuron & a postganglionic neuron.

-The preganglionic for SNS exits the spinal cord in the T1-L2 region.

-The preganglionic for the PNS exits the spinal cord in the S2-S4 region plus the brain stem along with cranial nerves III, VII, IX and X.

-They postganglionic neurons innervate visceral structures such as smooth muscle, cardiac muscle and glands.

2

Name the two divisions of the ANS

Sympathetic- fight or flight

Parasympathetic- Rest and Digest

3

Define Neurotransmitter, Name the neurotransmitter of the ANS

-Neurotransmitters are chemicals that carry impulses across synapses.

-Acetylcholine is the neurotransmitter released from the preganglionic neurons in both PNS and SNS AND for the postganglionic neuron in PNS.

-Norepinephrine is the neurotransmitter released by the postganglionic neuron in SNS.

4

Explain the role of the hypothalamus and its relationship to the sympathetic and parasympathetic divisions

This is the control center

5

Describe the effects of the parasympathetic and sympathetic stimulation of the heart

PNS- decrease rate

SNS- Increases rate

6

Describe the effects of the parasympathetic and sympathetic stimulation of the  lungs

PNS- Decreases air passage ways

SNS- opposite

7

Describe the effects of the parasympathetic and sympathetic stimulation of the Digestino

PNS increases movement & secretions in all of digestion & SNS is opposite

8

Describe the effects of the parasympathetic and sympathetic stimulation of the pupil

PNS constricts pupil, SNS dilates pupil.

9

Describe the effects of the parasympathetic and sympathetic stimulation of the sweat gland

Only innervated by SNS and it causes you to sweat

10

Describe the effects of the parasympathetic and sympathetic stimulation of the adrenal medulla

Only innervated by preganglionic neurons in SNS and it causes the adrenal medulla to release epinephrine & norepinephrine to exaggerate the fight or flight response.

11

Describe the effects of the parasympathetic and sympathetic stimulation of the cutaneus blood vessels

Only innervated by SNS and it causes them to constrict to decrease blood flow.

12

Describe the effects of the parasympathetic and sympathetic stimulation of the adominal blood Vessels

Only innervated by SNS and it causes them to constrict to decrease blood flow.

13

Describe the effects of the parasympathetic and sympathetic stimulation of the skeletal muscle blood vessels

Only innervated by SNS and it causes them to dilate to increase blood flow.