Baroreceptor - short term adjustment
Kidney - Long term adjustment by fluid balance
Inspiration
--> Increase in HR
Because
NB:
In Berne and Levy [BL8:p193]
Inflation of lung
--> Increase in vagal activity
--> Inhibition of vasomotor area
--> Vasodilation and decrease in BP
But at the same time [BL8:p93]
Moderate inflation of lung
--> Lung stretch receptor
--> Increase HR via vagus nerves
?? If vasomotor area is inhibited, why increase in HR
--> ?? Maybe it's reflex tachycardia due to drop in BP
Fluctuations in blood pressure synchronized with respiration
Inspiration
--> Increase in sympathetic tone
--> BP increase
* [BL8:p185]
In general, stimuli that increase HR also increase BP
However, exceptions are:
Hypertension with bradycardia (and hypoventilation)
Hypotension with tachycardia
Hypertension with bradycardia
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Reviewed | 20050816 |