The two factors that assist the relatively low venous pressures in propelling blood toward the heart are (a) ventricular systole and valve closure. (b) gravity and vasomotion. (c) muscular compression and the respiratory pump. (d) atrial and ventricular contractions.

In a healthy adult blood flow in the left coronary artery is less during systole than diastole. This difference is best explained by a change in which of the following (a) Coronary arterial Po2 (b) Extravascular Pressure (c) Flow through the aortic valve (d) Parasympathtic nerve activity (e) Sympathetic nerve activity

1) Which of the events below occurs when the semilunar valves are open? A) Ventricles are in diastole. B) Blood leaves pulmonary arteries and the aorta. CAV valves are closed. D) Both A & B E.) None of the above

Blood within the veins is prevented from flowing away from the heart because of the presence of: (a) venous reservoirs. (b) muscular walls. (c) clots. (d) valves.

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Compared with the interstitial fluid that bathes active muscle cells, blood reaching these cells in arteries has a(A) lower osmotic pressure.(B) higher PO2.(C) lower pH.(D) higher PCO2.(E) greater bicarbonate concentration.

When moving from lying down to standing, blood pressure would drop most significantly where?     a)  in the inferior vena cava       b)  in the splenic artery   c)  in the lower extremities   d)  in pulmonary vein

(a) (b) (c) The part of the illustration in the middle (b) shows Pressure at which you would hear the first heart sounds Diastolic pressure O Initial inflation of the BP cuff None of these is correct Pressure at which heart sounds would stop

1) unoxygenated blood leaves the right ventricle via the .................. to get to the lungs?

The aorta is the principal blood vessel through which blood leaves the heart in order to circulate around the body. (a) Calculate the average speed of the blood in the aorta if the flow rate is 5.0 L/min. The aorta has a radius of 10 mm. (b) Blood also flows through smaller blood vessels known as capillaries. When the rate of blood flow in the aorta is 5.0 L/min, the speed of blood in the capillaries is about 0.33 mm/s. Given that the average diameter of a capillary is 8.0 μm (1 μm = 1 X 10 –6 m), calculate the number of capillaries in the blood circulatory system.