lengthens Phase 2
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During exercise an increase in heart rate corresponds to a shortening of the cardiac cycle (RR interval decreases). Most of this shortening occurs in the TP interval. The QT interval also shortens, but only slightly. then the interval shortens as the heart rate increases.
That's 18 qt less 7 qt ie 11 qt = 2 gal 3 qt
Fill 5 qt pail. Then from full 5 qt fill 3 qt pail. You now have 2 qt left in 5 qt pail. Now empty 3 qt pail then put the 2qt from 5qt pail into this 3 qt pail. Now refill 5 qt pail Use this top off 3 qt till full this leaves you with 4 qts in 5 qt pail
5 qt 2pt
17 gal 2 qt