Page 1 of 2: physiology: most potent chem stimulant to respiration

trinity · Credits: 13371 My Scrapbook

The most potent chemial stimulant to respiration is:

a) oxygen

b) carbon dioxide

c) Hydrogen ions

4) carbon monoxide

Is it b or c? plz answer wid explanation!

ardy · Credits: 12764 My Scrapbook

these lines frm ganong may help u trinity
The magnitude of stimulation is proportionate to H+ ions conc.Thus the effect of CO2 on respiration r mainly due to its movement into CSF & brain interstitial fluid, whrer it increases H+ ion conc & stimulate receptors sensitive H+.

ans is C.

flowerchildn · Credits: 7753 My Scrapbook

so itllultimately be b right
hions r due to co2

trinity · Credits: 13371 My Scrapbook

EXACTLY folks!! that is my confusion!! shld it be CO2 or hydrogen ions??? Though its CO2 which is the source, the final one which is actually acting is H+ ions....so what shld we mark as the answer?

dr_neo · Credits: 15131 My Scrapbook

I dont hv exact reference page..But in Ganong Respiration.Chemical receptor of respiration.

Pco2 is the main cause for stimulating carotid bodies even in cases where pH is 7.3 - 7.5

So, i think answer is CO2....also given in Guides too..But ofcourse not very sure..

nutsnitin · Credits: 15174 My Scrapbook