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WorksheetsPost test CVS physiology
Total questions: 10
Worksheet time: 10mins
In regards to coronary physiology, which of the following statements is FALSE?
The two major determinants of coronary blood flow are perfusion pressure and vascular resistance.
Blood supply to the LV is directly dependent on the difference between the aortic pressure and LV end-diastolic pressure
(coronary perfusion pressure), and inversely related to the vascular resistance to flow, which varies to the fourth power of
the radius of the vessel.
Resting coronary blood flow in the adult is approximately 25 mL/min (0.1 mL/min/g) or 10% of total cardiac output.
The LV subendocardium is exposed to a higher wall pressure than the subepicardial layer during systole.
In regard to LV systolic function, which of the following statements is FALSE?A. B. C. D.
LV hypertrophy is an important adaptation response to chronic increases in LV afterload that reduces LV wall stress byincreasing wall thickness.
Cardiac output and ejection fraction are most often used to quantify LV systolic function.
Contractility may decline at heart rates greater than 175 beats/min.
End-diastolic volume is most often used to define LV afterload.
Which of the following statements regarding the LA is FALSE?
When compared to the LV, the LA is more susceptible to acute increases in afterload because the LA has thinner walls and less muscle mass.
LA contractile dysfunction occurs as the chamber dilates in response to reduced LV compliance and increased pressure.
The LA acts as a contractile chamber, a reservoir, and a conduit and its function is crucial to LV performance.
Exercise enhances LA contractility and reduces its reservoir function.
Which of the following statements about the heart's electrical activity is FALSE?
The initial SA node depolarization is rapidly transmitted across the RA to the AV node by the anterior, middle, andposterior internodal pathways.
Atrial depolarization normally is directed solely to the RV and the LV through the AV node.
Supraventricular tachyarrhythmias can result due to accessory pathways that bypass the AV node and establish abnormal conduction between the atria and ventricles.
AV node conduction is relatively fast compared with the pathways proximal and distal to it.
Which of the following statements regarding heart failure with normal ejection fraction (HFNEF) is FALSE?
Response to medical therapy does not predict prognosis in patients with HFNEF.
A possible cause of HFNEF includes an abnormal coupling between the LV and the arterial circulation.
LV diastolic dysfunction is a primary cause of HFNEF.
The severity and response to medical therapy are key factors that establish exercise tolerance.
Oxygen consumption (Vo2) is measured in a 70-kgsubject on a treadmill at 2500 mL per minute. This corresponds to:
1 metabolic equivalent (MET)
5 METs
10 METs
15 METs
Each of the following could be placed on the x-axis of the curve shown in the figure EXCEPT
Stroke volume
Left ventricular end-diastolic pressure
Left ventricular end-diastolic volume
Left atrial pressure
In a normal person, what percentage of the cardiac output is dependent on the “atrial kick”?
25%
35%
45%
55%
Normal resting myocardial O2 consumption is
2.0 mL/100 g/min
3.5 mL/100 g/min
8 mL/100 g/min
15 mL/100 g/min
Under maximum stress, how much cortisol is produced per day?
50 mg
150 mg
250 mg
350 mg
