ANS Flashcards
Are visceral motor functions easily controlled by the conscious will?
No. Like nausea, sweating, and full bladder
The ANS is a system of _____ neurons
motor
Regulates ______ visceral functions such as…..
unconscious
- heart rate
- blood pressure
- digestion
- urination
The ANS innervates…..
smooth muscle
cardiac muscle
glands
Somatic motor innervation
one motor neuron extends from CNS to skeletal muscle
-myelinated axons
Autonomic innervation
two motor neurons
-slower conduction
preganglionic neuron- spinal cord and brain
postganglionic neuron- autonomic motor pathway
Divisions of the ANS
sympathetic and parasympathetic
Sympathetic division
responds to dangerous or exciting situations
-increased HR and breathing
-widened pupils
nonessential functions are inhibited
What organs have only sympathetic innervation?
- sweat glands
- adrenal medulla
- arrector pili
- blood vessels
What part of the brain elicits a terror induced systemic response?
midbrain
Parasympathetic division
conserves body energy and directs vital activities
-dominates sympathetic impulses
SLUDD
-salivation, lacrimation, urination, digestion, defecation
What are the 3 decreases with the parasympathetic division?
HR
diameter of airways
diameter of pupils
What happens when there is no escape route or no way to win?
- massive activation of parasympathetic division
- loss of control over urination and defecation
Where do sympathetic and parasympathetic responses arise from?
S- thoracolumbar region
PS- craniosacral region
Length of postganglionic neurons in sympathetic and parasympathetic divisions?
S- long
PS- short
