chemoreceptors ?
April 29th, 2010
fox67676 asked:
my quiestion about the chemoreceptors ,, where they are located ?? in the carotid body of carotid sinuses ?? and the chemoreceptors that affect the cardiovasculer system there are the same that affect the respiratory system ??
im alitille bit confused ,,,
carotid body or carotid sinuses *
Article by SMANSA
my quiestion about the chemoreceptors ,, where they are located ?? in the carotid body of carotid sinuses ?? and the chemoreceptors that affect the cardiovasculer system there are the same that affect the respiratory system ??
im alitille bit confused ,,,
carotid body or carotid sinuses *
Article by SMANSA
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Central chemoreceptors are located near the DRG (dorsal respiratory group) in the medulla (Brainstem, CNS). They are sensitive to changes in CO2, but not O2. Their info is used by the DRG to control minute changes in ventilation, and respond to changes in the partial pressure of CO2 in the blood (pCO2).
Peripheral chemoreceptors (glomus cells) are located in the aortic and caritid bodies, and respond to pO2, pCO2 and pH changes and send their info back to the CNS to control respiration. The carotid bodies are located INSIDE the carotid sinuses.
The chemoreceptors detect information about the gas content of blood, and their information is monitored by the CNS to determine the optimum pumping rate by the heart, and the optimum level of opening of the capillaries in the loungs to provide the right ventilation/perfusion ratio for optimum gas exchange in the lungs.
Think about it – if the heart is pumping too fast, there will not be enough time for gas exchange, and if the heart is pumping too slow, or there aren’t enough capillaries available for gas exchange (recruitment) then you won’t have the ideal p02 of 90 mmHg, and you might have too high (>40 mmHg) of a pCO2.
So both of these receptors are used to monitor the blood content to the brain (central) and tissues (peripheral) so that the medullary repiratory control centers (DRG) can provide the right signals to the lungs to acheive optimum ventilation/perfusion. So yes, the chemoreceptors are for both systems, as they go hand in hand.
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