Easy enough biology question..?

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Jessie188

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that d) is supposed to be up with the first question!!!!
An increase in the rate of contractions of the diaphragm and rib muscles would indicate:
a)decreased hydrogen ion concentration
b)decreased reduced hemoglobin in the blood
c)increased concentration of bicarbonate ion in the blood

and

High blood concentrations of which substance increases the rate and depth of breathing?
a)acetylcholine
b)hydrogen ions
c)oxyhemoglobin
d)carbonic anhydrase

and!!!

What condition initiates exhalation?
a)high oxygen levels in the blood
b)low air pressure in the thoracic cavity
c)low carbon dioxide levels in the blood
d)increased stimulation of the stretch receptors of the alveoli

thanks!
d)increased concentration of oxyhemoglobin in the blood
 
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