Autonomic Nervous System Flashcards Preview

Anatomy Final > Autonomic Nervous System > Flashcards

Flashcards in Autonomic Nervous System Deck (35):
1

Portion of the peripheral nervous system that functions without conscious effort (involuntary)

Autonomic Nervous System

2

What does the ANS do

it mainly regulates visceral activities and maintains homeostasis

3

What does the ANS consist of

Efferent Viceral nerve fibers and associated ganglia

4

Autonomic Function are

reflex actions controlled from centers in the Hypothalamus, Brain Stem and spinal cord

5

Small clusters of neurons (including cell bodies) outside the CNS

Ganglia

6

What do the Ganglia do in the ANS

they integrate impulses before sending them out into the body; this allows some independence in function

7

The nerve fibers carry an impulse to the ganglion from the CNS

Preganglionic Fibers

8

Nerve fibers that carry an impulse from the ganglion to effector

Postganglionic Fibers

9

Most visceral organs are mainly made active by one division of the ANS

Visceral Organ Control

10

What are the two division of the ANS

Sympathetic and Parasympathetic; they often act antagonistically to each other.

11

What does the Sympathetic division do; what does the stress stand for

It prepares the body for stressful and emergency conditions; "stress or scared"

12

What activates "Fight or Flight"

Activated by rage or fear

13

What are the effects of the Sympathetic Division

~Increased heart rate
~Increased Blood Pressure
~Decreased G.I. movement and secretions
~Decreased bowel and urine flow
~Dilation of airways and pupils (extra O2 and vision)
~Blood flow is shifted from skin,mucosa, and abdominal viscera to the heart, brain, and skeletal muscle
~Increased sweating
~Orgasm/ Ejaculation

14

Sympathetic Nerve Fibers are located on

the nerves from the thoracic and lumbar regions

15

Preganglionic fibers for the Sympathetic division are

short

16

Postganglionic fibers for the Sympathetic division are

Long

17

Ganglia of the sympathetic division are located alongside the vertebral column

Paravertebral Ganglia

18

Neurotrasmitters of the Sympathetic Division

Acetylcholine- secreted by preganglionic nerves
Norepinephrine- secreted by postganglionic nerves

19

What are the two receptors of the Sympathetic Division

Nicotonic Cholinergic Receptors; Adrenergic receptors

20

Where can nicotinic cholinergic receptors be found and what does it react to

at ganglion; acetylcholine but also Nicotine

21

Where can Adrenergic receptors be found and what does it react to

at effector, reacts to norepinephrine

22

"peaceful" diviosion of ANS, most active under ordinary conditions

Parasympathetic division

23

What does the parasympathetic division do

it allows for energy conservation and restoration

24

What are the effects of the Parasympathetic Division

~Decreases Heart rate
~Decreases Blood pressure
~Increased G.I. movements and secretions
~Empties the bladder and rectum
~Constriction of airways and pupils
~Erection of penis/clitoris

25

Parasympathetic nerve fibers are located

from the cranila nerves 3,7,9,10 and sacral nerves

26

The preganglionic fibers of the Parasympthetic division are

Long

27

The postganglionic fibers of the Parasympthetic division are

Short

28

What are the Neurotransmitters of the parasympathetic Division

only acetylcholine

29

What are the two receptors used by the Parasympathetic division

Nicotinic cholinirgic receptors- at ganglion
Muscarinic cholinirgic receptors- at effectors
(both react to acetylcholine)

30

The ANS is largely controlled by

the CNS

31

What does the medulla oblongata do in regards to the ANS

it regulates cardiac, vasomotor, and respiratory activities

32

What regulates many of the visceral functions of the ANS

the Hypothalamus

33

What portions of the hypothalamus control the parasympathetic division

medial and anterior regions

34

What portions of the hypothalamus control the sympathetic division

lateral and posterior regions

35

The higher brain center controls

~Limbic system- emotions
~Cerebral Cortex- connects to the ANS through the limbic system