Autonomic Nervous System Flashcards
Autonomic nervous system regulates what?
Regulates Activities of internal organs
Autonomic nervous system is mainly what? Which means (2)
Autonomous
- acting independently of the body consciousness & voluntary control
What are the 2 directions of autonomic nervous system?
Sympathetic ( sns )
Parasympathetic ( PSNS)
What are some situations that activate SNS? (4)
Alertness
Energy
Facing danger
Physical activity
Sns does what to
Cardiac output?
Respiratory rate?
Releases stored what?
What happens to pupils?
What happens to digestion?
What happens to urination?
Increase cardiac
Increase respiratory
Release storage energy ( glucose )
Dilates pupils
Decreased digestion
Decrease urination
Parasympathetic does what two things?
Conserves & restores
PSNS does what?
Cardiac output?
Respiratory rate?
Releases stored what?
What happens to pupils?
What happens to digestion?
What happens to urination?
Decrease cardiac
Decrease respiratory rate
Stores energy
Constricts pupils
Increase digestions
Increase urination
Sympathetic nervous system is known as?
Fight or flight
Parasympathetic is known as?
Rest & digest
In most organs the SNS & PSNS are both simultaneous active producing a background rate of activity called?
Autonomic tone
What does autonomic tone mean?
Balance of SNS & PSNS
The autonomic tone changes or shifts to sns or PSNS why?
Because it depends on what the body needs
Some organs for example like the smooth muscle of blood vessels only get sympathetic fibers why?
Partially to constrict and help with blood pressure
The autonomic nerve pathways from the control central from the central nervous system to the target organs are composed of what 2 neurons?
Preganglionic myelinated
Postganglionic unmyelinated
These two neurons meet at a ___ and synapse
Autonomic ganglion
For SNS preganglionic neurons come arise from what? (2)
Thoracic & lumbar regions of the spinal cord
PSNS preganglionic neurons arise from what? (2)
Brainstem & sacral region of the spine
PSNS nerves exit the Brainstem how??
Cranial nerves
SNS takes a while to get to specific organs why?
Because they have a longer and less specific location
PSNS produces more specific localized responses compared to SNS why?
Because they have specific and detailed locations to be at & shorter time to get there
