Exam 19: Integrated Control of the Cardiovascular System

A well-trained athlete has prepared to run in the Boston marathon.Your purpose is to study how this athlete's cardiovascular system adapts to the strenuous demands of the race.Assume that just before the athlete runs,measurements of heart rate (60 beats/minute),blood pressure (110/80 mm Hg),and cardiac output (4.2 L/minute)are recorded. What is this athlete's pulse pressure?

A well-trained athlete has prepared to run in the Boston marathon.Your purpose is to study how this athlete's cardiovascular system adapts to the strenuous demands of the race.Assume that just before the athlete runs,measurements of heart rate (60 beats/minute),blood pressure (110/80 mm Hg),and cardiac output (4.2 L/minute)are recorded. Assume that central venous pressure is 0 mm Hg,and calculate the athlete's peripheral resistance.

In the cardiac and vascular function curves shown below,the solid curves represent the control state: The shift,illustrated by the dashed line,is explained by:

In the cardiac and vascular function curves shown below,the solid curves represent the control state: The shift in these curves,illustrated by the dashed lines,is best explained by:

A well-trained athlete has prepared to run in the Boston marathon.Your purpose is to study how this athlete's cardiovascular system adapts to the strenuous demands of the race.Assume that just before the athlete runs,measurements of heart rate (60 beats/minute),blood pressure (110/80 mm Hg),and cardiac output (4.2 L/minute)are recorded. Estimate the athlete's stroke volume.

A 44-year-old woman experienced an acute episode of severe abdominal pain and suddenly vomited a large volume of bloody fluid.Her husband had her brought to the hospital by ambulance.The emergency room physician estimated the she had lost about 600 mL of blood.On physical examination,she had a blood pressure of 85/65 mm Hg and was tachycardic,with a heart rate of 110 beats/minute.The patient's skin was cool,moist,and pale.The physician's tentative diagnosis was of a bleeding ulcer. Administration of a drug that acts specifically to improve myocardial contractility would:

A 44-year-old woman experienced an acute episode of severe abdominal pain and suddenly vomited a large volume of bloody fluid.Her husband had her brought to the hospital by ambulance.The emergency room physician estimated the she had lost about 600 mL of blood.On physical examination,she had a blood pressure of 85/65 mm Hg and was tachycardic,with a heart rate of 110 beats/minute.The patient's skin was cool,moist,and pale.The physician's tentative diagnosis was of a bleeding ulcer. What would the acute blood loss from her duodenal ulcer be expected to do?