15 Questions
What is the approximate total peripheral resistance in Wood units if the cardiac output is 6 L/min and the mean arterial pressure is 90 mmHg?
15
Which of the following is a characteristic of the capillary network?
Largest cross-sectional area despite small diameter due to large numbers
What percentage of blood volume is present in the pulmonary circulation?
25%
Which of the following is a characteristic of the pulmonary circulation?
Low pressure and low resistance
What is the feature that is numerically similar in the systemic and pulmonary circulations?
Total blood flow
What is the total peripheral resistance (TPR) in Wood units for Bill, given his hemodynamic data?
0.30 Wood units
What is the characteristic of the vascular bed of an organ?
All arterioles are in parallel with capillaries they supply
What happens to blood flow to an organ if all arterioles of the organ vasoconstrict?
It decreases due to increased resistance
What is the effect of a decrease in the number of arterioles on organ resistance?
It increases organ resistance
What is the relationship between total peripheral resistance and blood pressure?
As TPR increases, blood pressure increases
What is the primary factor responsible for the large pressure loss across arterioles?
High vascular resistance
Which of the following equations is used to calculate cardiac output (CO) using the Fick principle?
CO = (O2 utilization / (CaO2 - CvO2))
What is the term for the pressure measured in the pulmonary artery when the balloon is inflated, which estimates the left atrial pressure?
Pulmonary artery wedge pressure
What is the term for the resistance to blood flow in the systemic circulation?
Systemic vascular resistance
What is the term for the amount of blood ejected by the left ventricle per beat, which is normalized by body surface area (BSA) to obtain the stroke volume index (SVI)?
Stroke volume
Test your knowledge of cardiovascular physiology with these interactive questions. Calculate TPR in Wood units and understand vascular bed conditions in an organ.
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