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Flashcards in ANS 1 Deck (33):
1

CNS is the

brain and spinal cord

2

PNS is comprised of what two systems

Afferent and Efferent

3

The Afferent Sensory system is made up of

general and special senses

4

The Efferent motor system is

divided into the somatic and autonomic nervous system

5

The somatic system controls

Skeletal muscles

6

The Autonomic nervous system control

Smooth muscles, cardiac muscles, glands

7

The autonomic nervous system operates with conscious or unconscious control?

Unconscious

8

The ANS is responsible for coordinating processes that

maintain homeostasis

9

The ANS is divded into

Sympathetic and Parasympathetic divisions

10

The sympathetic division of the ANS

uses energy
dominant in conditions of physical or emotional stress
"fight or flight"

11

The parasympathetic division of the ANS

Conserves and restores energy
Dominant control during rest
"Rest and digest"

12

What are the effectors with dual innervation?

Heart
Pupils
Digestive tract
Bronchioles

13

Define dual innervation

An effector innervated with both sympathetic and parasympathetic stimulation

14

How do sympathetic and parasympathetic systems effect the heart

Sympathetic increases heart rate
Parasympathetic decreases heart rate

15

How do sympathetic and parasympathetic systems effect the pupils

Sympathetic dilates pupils
Parasympathetic constricts pupils

16

How do sympathetic and parasympathetic systems effect the digestive tract

Sympathetic decreases motility and secretions
Parasympathetic increases motility and secretions

17

How do sympathetic and parasympathetic systems effect the bronchioles?

Sympathetic dilates airways
Parasympathetic constricts airways

18

What effectors have sympathetic input only?

Sweat glands
Arrector Pili muscles
Blood vessels of skin, skeletal muscle, heart, lungs, brain, digestive viscera, and kidney

19

How does sympathetic activity effect sweat glands?

Increased secretion

20

How does sympathetic activity effect arrector pili muscles?

contraction

21

How does sympathetic activity effect blood vessels of skin skeletal muscle, heart, lungs, and brain?

Dilation

22

How does sympathetic activity effect blood vessels of digestive viscera and kidney?

Constriction

23

What effectors have only parasympathetic input?

Lacrimal glands

24

How does parasympathetic activity effect lacrimal glands?

Increased secretion

25

The efferent pathway is a ____ neuron pathway

Two

26

Describe cell communication in the efferent pathway

Motor neurons in CNS send preganglionic axons to synapse on autonomic ganglia in PNS. These ganglia send postganglionic axons to synapse on effector

27

Describe the structure of the Sympathetic pathway

Thoraco-lumbar division
Preganglionic cell body in T1-T2
Ganglion closer to CNS
Have: sympathetic chain ganglia, collateral ganglia, adrenal medulla

28

Describe the structure of the parasympathetic pathway

Cranio-sacral division
Preganglionic axon longer
Ganglion near or in effector organ
Postganglionic axon short
Preganglionic cell body in Cranial nerves and S2, S3, and S4

29

Define sympathetic chain ganglia

2 chains of ganglia, one on each side of vertebral column, innervate head, body wall, limbs, and viscera of thoracic cavity

30

Define collateral ganglia

Close to abdominal argeries
Pass through chain ganglia and form splanchnic nerves
Innervated abdominal and pelvic viscera

31

Sympathetic activation of the collateral ganglia

decreases blood flow and releases stored energy molecules

32

Define adrenal medulla

Central portion of adrenal gland
Postganglionic cells are modified neurons that secrete into blood rather than onto effectors

33

The parasympathetic division has preganglionic neurons in

the brainstem and sacral segments of spinal cord