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    The medulla oblongata controls breathing, heart rate and blood pressure.

    Describe how the medulla oblongata responds to an increase in carbon dioxide concentration in the blood during exercise.

    Explain how this response leads to a decrease in the concentration of carbon dioxide in the blood.

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    There are chemoreceptors in the medulla that can detect if there's too much CO2 in the blood. Basically it then sends a signal to the muscles in your chest cavity to pull downwards (or relax), contracting the lungs to ventilate - exhaling CO2 out.
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    cool, thanks.

    Anyone else feel free to add more
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    Chemoreceptors located in aorta and carotid artery detect a change in blood ph as when CO2 is in solution it causes solution to become more acidic.
    They then create an impulse that they send to the medulla oblongata in the brain.
    The medulla oblongata increases the frequency of impulses that it sends to the SAN via the sympathetic nervous system.
    This increases the frequency of the heart beat and increases movement of blood around the body so CO2 diffuses out of blood quicker.
    Once CO2 concentration decreases the increase in ph detected by chemorecepters and send impulse to medulla oblongata which reduces frequency of impulses to SAN via sympathetic nervous system.

    I think.....

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    nice one chewy, you lovely wookie
 
 
 
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