Chapter 09

Hall: Guyton and Hall Textbook of Medical Physiology, 12th Edition Chapter 09: Cardiac Muscle; The Heart as a Pump and Function of the Heart Valves Test Bank

1. What is his resting cardiac output in ml/minute? A. 900 B. 8,000 C. 9,000 D. 10,000 E. 15,000 ANS: C 2. What event occurs at point D in the man’s pressure-volume relationship? A. A-V valves close B. Aortic valve opens C. Aortic valve closes D. A-V valves open E. Third heart sound

Intraventricular Pressure (mmHg)

Questions 1-3: A fifty-year-old man has a body weight of 110 kg, resting heart rate is 90 beats/minute, arterial pressure is 120/70 mmHg, arterial hematocrit is 35% and body temperature is normal. His pressure-volume diagram of the left ventricle is shown below. 200 150 D

100

C

50 A 0

50

B 100

150

200

Left Ventricular Volume (ml)

ANS: C 3. What is his ventricular ejection fraction? A. 33% B. 50% C. 60% D. 67% E. 80% ANS: D 4. Which of the following will result in spastic contraction of the heart? A. Excess calcium ions in the blood B. Excess potassium ions in the blood C. Excess sodium ions in the blood D. Decreased sympathetic stimulation E. Decreased norepinephrine concentration in the blood ANS: A Copyright © 2011, 2006 by Saunders, an imprint of Elsevier Inc.

Test Bank

9-2

5. What is her resting heart rate in beats/minute? A. 70 B. 80 C. 90 D. 100 E. 110 ANS: C

Intraventricular Pressure (mmHg)

Questions 5-7: A sixty-year-old woman has a body weight of 110 kg, resting cardiac output is 9,000 ml/minute, arterial pressure is 90/50 mmHg, arterial hematocrit is 25% and body temperature is normal. Her pressure-volume diagram of the left ventricle is shown below. 200 150 D

100

C

50 A

6. What event occurs at point A in the woman’s pressure-volume relationship? A. A-V valves close B. Aortic valve opens C. Aortic valve closes D. A-V valves open E. Third heart sound

0

50

B 100

150

200

Left Ventricular Volume (ml)

ANS: D 7. If the woman is given a 500 ml whole blood transfusion over a 15 minute period, her ventricular preload will increase. One minute after the transfusion is complete, what will the new stroke volume be assuming her heart is normal? A. 70 ml B. 80 ml C. 90 ml D. 100 ml E. 120 ml ANS: A

8. When does the third heart sound occur in the ventricular pressure-volume relationship? A. At point D B. Between point A and point B

Intraventricular Pressure (mmHg)

Questions 8-9: A fifty-year-old man has a body weight of 110 kg, resting heart rate is 90 beats/minute, arterial pressure is 120/70 mmHg, arterial hematocrit is 35% and body 200 temperature is normal. His pressure-volume diagram of the left ventricle is shown below. 150

D

100

C

50 A 0

50

B 100

Copyright © 2011, 2006 by Saunders, an imprint of Elsevier Inc.

150

200

Left Ventricular Volume (ml)

Test Bank

9-3

C. Between point B and point C D. Between point C and point D E. Between point D and point A ANS: B 9. When does the second heart sound occur in the ventricular pressure-volume relationship? A. At point D B. Between point A and point B C. Between point B and point C D. Between point C and point D E. Between point D and point A ANS: A

Copyright © 2011, 2006 by Saunders, an imprint of Elsevier Inc.