question: Q:During a clinical study examining the effects of exercise, men between the ages of 20 and 30 years are evaluated during a 15- minute session on a treadmill. The average pulse for the last 2 minutes of the session is 175/min. During the last minute of exercise, various measurements are taken. Compared with the measurement before the session, which of the following is most likely to be decreased?? 
  A:Pulse pressure;B:Stroke volume;C:Systolic blood pressure;D:Total peripheral resistance