17. ANS Overview

Question 1

What is ANS?

Answer 1

ANS works to maintain homeostasis through unconscious responses to physiologic changes in the body.

Question 2

How does ANS fxn?

Answer 2

ANS feedbacks between internal environ + CNS via sensory + effector (motor) neurons to maintain homeostasis.

Question 3

What happens to maintain homeostasis?

Answer 3

• Sensing changes via receptors + delivering that info via afferent path to control center (CNS)
• Control center constantly sampling receptor data + det. appropriate responses
• Using efferent path to bring about sp. response at effector or response organ (motor + muscle; hormone + glands)

Question 4

What are divisions of nervous system?

Answer 4

• NS divided into CNS + Peripheral NS
• PNS divided into somatic + autonomic
  
  • Somatic = conscious motor fxn
• ANS divided into sympathetic + parasympathetic + enteric
  
  • All interdependent to maintain balance, but each has diff resp. ondiff organs
  • SNS = fight/flight, blood shunted to periphery, heart, brain + muscles
  • PNS = rest/digest

Question 5

What is dysautonomia?

Answer 5

• Dis-regulation of ANS, when reflexes go haywire/have exaggerated responses
• Can be caused by many diseases leading to dysautonomia