Exam 14: Overview of the Circulation; Biophysics of Pressure, Flow, and Resistance

The arterioles are constricted in a muscle bed of an experimental animal. Which set of physiological changes would be expected to occur in response to constriction of the muscle arterioles?

Under controlled conditions, flow through a blood vessel is 10 mL/min under a pressure gradient of 100 mm Hg. An increase in which of the following would occur in response to a twofold increase in the diameter of the vessel with a pressure gradient maintained at 100 mm Hg?

If the blood flow through the kidney is 1200 mL/min and the renal artery pressure is 100 mm Hg and the renal venous pressure is 0 mm Hg, which of the following is the conductance (in mL/min/mm Hg) of the renal vessel?

An increase in which of the following would decrease blood flow across a vessel?

Which of the following would tend to cause an increase in blood flow?

The diameter of a precapillary arteriole is increased in a muscle vascular bed. A decrease in which of the following would be expected?

A 78-year-old woman has a mean arterial pressure of 120 mm Hg and a heart rate of 60 beats/min. She has a stroke volume of 50 mL, cardiac output of 3000 mL/min, and a right atrial pressure of 0 mm Hg. What is the total peripheral resistance (in mm Hg/mL/min) in this woman?

Which of the following components of the circulation has the lowest velocity of blood flow?

The table below depicts the pressure gradient, radius, and viscosity in various vessels of the same length. Which vessel has the greatest flow? A 100 1 10 B 50 2 5 C 25 4 2 D 10 6 1

An increase in shear stress in a blood vessel would result in which of the following changes?

Which vessel has the highest vascular resistance? A 1000 100 B 1200 60 C 1400 20 D 1600 80 E 1800 40

A 50-year-old woman has a renal blood flow of 1000 mL/min and hematocrit of 50%. Her arterial pressure is 120 mm Hg and her renal venous pressure is 20 mm Hg. She also has a plasma colloid osmotic pressure of 25 mmHg. What is the total renal vascular resistance (in mm Hg/mL/min) in this woman?