Peripherial NS - Autonomic

Question 1

The ANS controls what?

Answer 1

Vegetative, largely involuntary functions of the body

Question 2

The ANS controls what, specifically?

Answer 2

1. smooth muscle of blood vessels, lens of eye, gut, bladder
2. cardiac muscle
3. glands
4. Sympathetic and parasympathetic – most organs have both and they have opposite effects

Question 3

Sympathetic NS does what?

Answer 3

Mediates increased and rapid energy use

Question 4

How does the SNS mediate inreased and rapid energy use?

Answer 4

• increasing blood flow to skeletal muscles
• stimulates release of epinephrine which causes increased heart rate and increased blood sugar level
• sweat glands
• exit s.c. from thoracic and lumbar levels
• most synapse in the sympathetic ganglion outside s.c.
• most preganglionic neurons secrete Ach; postganglionic secrete norepinephrine

Question 5

What does the ParaNS do?

Answer 5

Mediates processes responsible for storage of energy

Question 6

Specifically, what is the PSNS responsible for?

Answer 6

• salivation
• gastric and intestinal motility
• secretion of digestive juices
• increased blood flow to gastrointestinal system
• exit s.c. from cervical and sacral levels
• neurons secrete Ach