Deck 9: Cardiac Muscle; the Heart As a Pump and Function of the Heart Valves

Question 1

Use the following information to answer Questions 8 and 9. A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35%, and normal body temperature. His pressure-volume diagram of the left ventricle is shown below.

-When does the fourth heart sound occur in the ventricular pressure-volume relationship?


A. At point $\mathrm { D }$
B. Between point $\mathrm { A }$ and point $\mathrm { B }$
C. Between point $B$ and point $C$
D. Between point $C$ and point $D$
E. Between point $\mathrm { D }$ and point $\mathrm { A }$
Left Ventricular Volume ( $\mathrm { mI } )$

Answer 1

B

Question 2

Use the following information to answer Following Questions . A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35% and a normal body temperature. His pressure-volume diagram of the left ventricle is shown below.
What is his ventricular ejection fraction?

A)33%
B)50%
C)60%
D)67%
E)80%

Answer 2

D

Question 3

Use the following information to answer Questions 8 and 9. A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35%, and normal body temperature. His pressure-volume diagram of the left ventricle is shown below.
When does the first heart sound occur in the ventricular pressure- relationship?

A)At point B
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

Answer 3

A

Question 4

Use the following information to answer Questions 5-7. A 60-year-old woman has a body weight of 110 kg, resting cardiac output of 9000 ml/min, arterial pressure of 90/50 mm Hg, arterial hematocrit of 25%, and normal body temperature. Her pressure-volume diagram of the left ventricle is shown below.
What event occurs at point A in the woman's pressure-volume relationship?

A)Atrioventricular valves close
B)Aortic valve opens
C)Aortic valve closes
D)Atrioventricular valves open
E)Third heart sound

Question 5

Use the following information to answer Following Questions . A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35% and a normal body temperature. His pressure-volume diagram of the left ventricle is shown below.
Which of the following will result in a dilated heart?

A)Decreased calcium ions in the blood
B)Decreased magnesium ions in the blood
C)Increased sodium ions in the blood
D)Increased sympathetic stimulation
E)Increased norepinephrine concentration in the blood

Question 6

Use the following information to answer Questions 5-7. A 60-year-old woman has a body weight of 110 kg, resting cardiac output of 9000 ml/min, arterial pressure of 90/50 mm Hg, arterial hematocrit of 25%, and normal body temperature. Her pressure-volume diagram of the left ventricle is shown below.
At the end of ventricular isovolumic relaxation, which of the following occurs?

A)Atrioventricular valves close
B)Aortic valve opens
C)Aortic valve closes
D)Mitral valve opens
E)Pulmonary valve closes

Question 7

Use the following information to answer Following Questions . A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35% and a normal body temperature. His pressure-volume diagram of the left ventricle is shown below.
What event occurs at point D in the pressure-volume relationship?

A)Atrioventricular valves close
B)Aortic valve opens
C)Aortic valve closes
D)Atrioventricular valves open
E)Third heart sound

Question 8

Use the following information to answer Following Questions . A 50-year-old man has a body weight of 110 kg, resting heart rate of 90 beats/min, arterial pressure of 120/70 mm Hg, arterial hematocrit of 35% and a normal body temperature. His pressure-volume diagram of the left ventricle is shown below.