Challenge #22 Question 1. The human heart beat has two phases, systolic and diastolic. Which of these presents the normal pressure of between 70 and 90 mg. of mercury? Answer: Diastolic c) The diastolic phase represents the blood pressure existing during the moments between the contractions of the ventricles which are the lower, muscular chambers of the heart. The systolic blood pressure exhibited by the contraction of the ventricles is normally within the range of 120 to 140 mg. of mercury. Correct answer received from: James Pyrich, J.C., Jimmy D., Shi, Rogie Legaspi, Shabaz, Enis, Corky, car doctor, Heubey, Danny Bob, Jane, Carolyn, Rachel, Diana, Beefcake, Teach, Pud,