Chapter 9 - The ANS Flashcards Preview

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Flashcards in Chapter 9 - The ANS Deck (40):
1

Effectors of Autonomic Neurons

Cardiac muscle
Smooth muscle
Glands

2

TRUE/FALSE :
ANS has pre- and post- gangliac neurons

True

3

Somatic motor neurons

Cell bodies in spinal cord
1 neuron traveling to effector

4

Autonomic motor system

2 sets of neuron in PNS
1st has cell bodies in brain/spinal cord & synapses in autonomic ganglia
2nd has cell bodies in ganglion & synapses on effector

5

Sympathetic

"Fight, flight, & stress"

Increase glucose secretion
Exhibit tonic activity

6

Parasympathetic

"Rest & digest"

Produce opposite effects

7

Sympathetic Division

Aka thoracollumbar division
It's preglangionic neurons exit spinal cord from T1 to L2

8

SD - most synapse on postganglionic neurons in the

Para Vertebral

9

SD - para vertebral ganglia forms what chain of interconnected ganglia paralleling spinal cord

Sympathetic ganglionic chain

10

Divergence

Preganglionic neuron may synapse with many postgangliac neurons s

11

Convergence

Different preglangionic neurons may synapse on SINGLE postgangliac neuron

12

Mass activation

Sympathetic act as a unit

13

Some preglangionic do not synapse in para vertebral ganglion but go to outlying :

Collateral ganglion

14

Adrenal medulla location

On top of kidney

15

Collateral Ganglion

Secretary cells appear to be modified postganglionic neurons

Release 85% epinephrine, 15% norepinephrine into blood

In response to preglangionic stimulation

Stimulated during mass activation

16

Epinephrine made by

Methylating norepinephrine

17

Parasympathetic Division

Aka craniosacral division
preglangionics fibers Originate in brain
Pre fibers will Synapse in ganglia located next to organs innervated
Parasym gang (terminal ganglia) supply postgang fibers that synapse on effector

18

PSD-
Long vagus nerve

Carries most parasympathetic fibers


19

Vagus (wondering )

Innervate heart, lungs, stomach, liver, sm. intestine, upper half of lg intestine, esophagus, pancreas

20

Preganglionic fibers 52-4 innervate

Innervate lower half of lg intestine, rectum, urinary, & reproductive system

21

Both symp&parasym preganglionics release

ACh

22

Parasympathetic post ganglionic release

ACh called cholinergic synapses

23

Most sympathetic post ganglionics release

Norepinephrine called adrenergic synapses

And only a small # release ACh

24

Post ganglionics have unusual synapses called

Varicosities
which releases NTs along a length of axon aka synapses en passant

25

Adrenergic Stimulation causes

Both excitation and inhibits room depending on tissue

26

2 major broad subtypes of Adrenergic Stimulation

Alpha & Beta adrenergic receptors
4 possible receptors

27

Drugs that PROMOTE actions of NT

Agonists

28

Drugs that INHIBIT actions of NT

Antagonists

29

T/F-
ACh is used at all motor neurons synapses on skeletal muscle, all preganglionics & parasym postganglionics

True

30

2 cholinergic receptors

Nicotinic - simulated by nicotine, blocked by curane

Muscarinic - muscarine, atropine

31

Somatic neurons release ACh to STIMULATE skeletal muscles

Excitatory

32

Postganglionic release ACh will mostly be

Excitatory, but sometimes inhibitory

33

Protein channels open = inhibitory or excitation ?

Closed?

Open= inhibitory

Closed= excitation

Both in muscarinic

34

Most visceral organs receive

Dual innervation supplied by both symp & parasympathetic
2 branches often antagonistics
Can be complementary or cooperative

35

Organs without dual innervation (symp)

Regulation achieved by increasing or decreasing firing rate

Eg adrenal medulla, arrector pili muscle, sweat glands

36

Controls activity of ANS in brain stem
(Cardiovascular, pulmonary, urinary, reproductive, & digestive systems)

Medulla oblongata

37

Centers for control of body temperature, hunger, & thirst, & can regulate medulla

Hypothalamus

38

Responsible for visceral responses that reflect emotional states (role in emotional drives: anger, hunger, sex, thirst, etc..)

Limbic system

39

Directing info to hypothalamus might combine to medulla which will give response

Cerebral cortex & cerebellum

40

Autonomic neurons

Innervate organs not under voluntary control

Neurons are motor but there are sensory neurons from the viscera for control