How does exercise effect the circulatory system?

Answer 1

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Answer 2

The heart increases in size in response to exercise, which results in thicker, stronger walls. The number of red blood cells increases, and the density of the capillary beds in the muscles surrounding the heart and lungs increases. This boosts the amount of blood pumped around the body per minute so oxygen is delivered faster to the working muscles.
The heart has to perform fewer beats, because the body receives more blood flow from the chambers of the heart with each pump. Since the heart does not have to beat as much, it becomes more efficient. It still supplies the body with the oxygen that it needs with a lower pulse rate. The arterial walls become more elastic to better handle any changes in blood pressure.

Ask if you don't understand anything or think somethings wrong but thats what i put in my GCSE exam and i got 96%(A*) so it should be right!!