breathing movements usually occur unconsciously
it is controlled by the medulla oblongata part of the brain situated at the breathing centre
medullar oblongata is in the brain
respiratory centre transmits impulses to the diaphragm through phrenic nerves
carbon iv oxide concentration in the blood determines the breathing rate
if carbon iv oxide is less, the brain is triggered to decrease breathing rate
cardiac frequency decreases and the arterioles constrict
therefore carbon iv oxide level is raised
this brings back to normal level of breathing and carbon iv oxide level increases/is more
the brain is triggered to increase breathing rate
cardiac frequency is increased
there is vasodilation of arterioles
carbon iv oxide level falls
therefore the normal level is attained and carbon iv oxide is removed faster
Mohaissack answered the question on October 5, 2017 at 12:18
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