Immediately before exercise athlete's experience a rapid increase in HR. This is caused by an ____ adrenaline rise. The adrenaline is released on the ____ ____ Node. During exercise ____ Dioxide levels increase. The acidity levels ____ the blood PH levels ____. This is detected by a ____ in the blood vessels. The medulla (Cardiac Control Centre) then employs the ____ nerve to speed up HR. As well as beating faster, the heart also beats stronger, which increases Cardiac Output ____ x HR). Once enough ____ and nutrients are reaching the muscles, the HR ____ into a steady state. After exercise, HR remains high, as the oxygen is used to remove waste products (CO2 and blood lactate). Blood pressure begins to drop as the demand for oxygen lessens. The ____ inform the medulla, Eventually the ____ nerve will be used to slow down HR.

A level HR during exercise

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