Circadian Rhythms Flashcards
How can the autonomic nervous system be split?
Enteric, sympathetic and parasympathetic
The control of temperature, blood pressure, hunger and satiety is via what axis?
The hypothalamic pituitary axis
The parasympathetic nervous system is characterised by certain axons, these are?
Long, unbranched, preganglionic neurones from the brainstem and spinal cord
Where is the parasympathetic ganglia located?
Close to their target organ
The sympathetic nervous system’s characteristic axon is…?
The short unbranched, preganglionic neurone from the thoraco-lumbar cord
The sympathetic ganglia is located where?
Close to the CNS
How do baroreceptors respond to an increased blood pressure?
Carotid artery and aorta stretch causes baroreceptors to increase their basal rate of action potential generation
Baroreceptor action potentials are conducted by which nerves?
The glossopharyngeal and vagus nerves
Where do the baroreceptors action potentials travel to?
The cardio regulatory and basso motor centres in the medulla oblongata
How does the cardio regulatory centre respond to increased action potentials?
Increases parasympathetic stimulation to the heart, decreasing heart rate and stroke volume
How does the cardiovascular centre react to the baroreceptors action potentials?
Decreases sympathetic stimulation, decreasing heart rate and stroke volume
Baroreceptors action potentials impact the vasomotor centre how?
Decreases sympathetic stimulation to blood vessels causing vasodilation
What is the purpose of the enteric nervous system?
Controls the GIT activity via the myenteric plexus
Where are the myenteric plexuses located?
GIT lining between the inner and outer layers of muscularis externa
How is the enteric nervous system innervated?
From the parasympathetic (vagus) and sympathetic chains
