L15: Autonomic Nervous Sytem Flashcards
What are the three divisions of the autonomic system
- sympathetic
- parasympathetic
- enteric
How is the activity of the sympathetic with the parasympathetic system described as
Antagonistic and dual innervation
How does the SNS and PNS control heart rate
SNS = increases heart rate PNS= decreases heart rate
Give an example when PNS and SNS act on different muscle
- PNS act on circular muscle of the pupil to cause constriction
- SNS act on radial muscle of the pupil to cause dilation
How do PNS and SNS differ with neurotransmitters at the post and pre-ganglions
PNS :
Pre and post ganglions release ach
SNS
Pre ganglions release Ach
Post ganglions release noradrenaline or adrenaline
Which type of adrenoceptos does adrenaline act on
Beta
What type of adrenoceptors does noradrenaline act on
Alpha
What are the sensory receptors of the the autonomic system
- receptors located in the viscera e.g chemo or baroreceptors
Give an example when PNS and SNS work together
In male sex organs
- PNS=Point
- SNS= Shoot
Give an example where there is no dual innervation
Most blood vessels are controlled by the SNS
- increased SNS activity = vasoconstriction
- decreases SNS activity = vasodilation
Give an example when the activity of PNS and SNS is not antagonistic
- sweat glands
- SNS= small volume and sticky saliva
- PNS = large volume and water saliva
Give an example when autonomic and somatic nervous system works together
When you focus from a far object to a close object
- Somatic= to move skeletal muscle of the eye
- Autonomic= to dilate or constrict the muscle
What are the effectors of the autonomic
- smooth
- cardiac
- secretory gland
How is the neurotransmitters released in the autonomic sytem
They are released in varicosity (bubbles with neurotransmitters) to give broadcasting
How is the release of neurotransmitters in the somatic nervous system described as
Discrete
