Control Of Arterial Blood Pressure Flashcards
What is the blood pressure threshold for carotid sinus receptors?
50 mmHg
At what blood pressure are carotid receptors saturated?
180 mmHg
What is the threshold for aortic receptors?
100 mmHg
What are the two type of baroreceptors?
Arterial and cardiopulmonary
What are arterial receptors?
High pressure stretch receptors in the carotid sinus and aortic arch.
What are cardiopulmonary receptors?
Low pressure receptors in the heart and pulmonary arteries
What are the 4 subtypes of cardiopulmonary baroreceptors?
Non-myelinated mechanoreceptors, coronary artery baroreceptors, chemoreceptor sensors, myelinated mechanorceptors
What is the significance of the positioning of arterial baroreceptors?
They are situated where the blood pressure should be at its highest so if its low then blood pressure is low
Where do arterial baroreceptors send signals to?
The medulla oblongata
What s the path of information from arterial baroreceptors?
Efferent fibres -> vagus nerves -> glosopharyngeal nerve -> medulla oblongata
What area of the medulla oblongata responds to signal from the baroreceptors?
The nucleus tractus solitarius
How is blood pressure decreased by the nucleus tractus solitarius?
It reduces sympathetic outflow
What do stretch receptors respond to?
Deformation of the vessel by blood pressure
What do the cardiopulmonary baroreceptors provide to the medulla oblongata?
Information on the fullness of vasculature which correlates with preload
Where are the sensory nerve endings of the cardiopulmonary baroreceptors located?
The wall of the vena cava, pulmonary artery and the veins and atria
