Control of blood pressure Flashcards
Why is the mean arterial pressure so important?
The driving force pushing blood through circulation
What could an MAP that is too low lead to?
Syncope (fainting)
What are the 2 sets of the baroreceptors called?
Aortic arch
Carotid sinus
What nerve do the carotid sinus baroreceptors use?
Glossopharyngeal nerve
What nerve do the aortic arch baroreceptors use?
Vagus nerve
Where do both sets of baroreceptors lead to?
The medullary cardiovascular centres
What do the medullary cardiovascular centres interpret?
Whether the baroreceptors are firing too low or too high
What do the parasympathetic fibres do the heart when controlled by the cardiovascular medullary centres?
Decrease HR
What do the sympathetic fibres do to the heart?
Activate beta-1 receptors
Increase heart rate
Increase contractility
Constrict smooth muscle in vessels
What are the other inputs to the cardiovascular medullary centres other than the baroreceptors?
Cardiopulmonary baroreceptors
Central chemoreceptors
Muscle chemoreceptors
Joint receptors
When is the baroreflex used the most?
During posture
What happens during standing posture?
Hydrostatic pressure increases
Decreased baroreceptor firing rate
Engages sympathetic nerves
What 3 hormone systems mediate the long term control of BP?
Renin-angiotensin-aldosterone system
Antidiuretic factor
Atrial natriuretic peptide
If collecting duct permeability increases, what happens to water reabsorption rate?
It increases
Where is renin produced?`
Juxtaglomerular of the kidney
