9. c) 1 Hz to 5 Hz
10. b) False; On standing, a certain amount of blood pools in the veins of the ankles or
legs, this pooling means that a smaller volume of blood returns to the heart, and the
decrease in blood volume causes a drop in blood pressure.
PROBLEMS ANSWERS:
Students should research the answers for Problem 1 on their own.
2. Tension in the vessel = (10 * 10–6) * 20 * 1300 = 0.26 dynes/cm2
CHAPTER 9
QUIZ ANSWERS:
1. b) 113
2. a) Direct
3. Preload is related to the amount of blood in the ventricle before contraction; afterload
is what comes after ventricular contraction
V2 = V3 = 17.15 m/sec
Solve: P2 + 103 * 9.8 * 15 = 1 * 105 + 103 * 9.8 * 5; P2 = 100000 – 98000 = 2000 N/m2
8. (0.2)2 * 2 = (0.1)2 * V; V in the constricted pipe = 8 m/sec, flow rate = 0.08 cubic
meter/sec
12. When ȡi * Ci = ȡb * Cb;
Cardiac output = (15 * (37 – 23) * 0.82 * 60)/(0.5 * 12 * (37 – 28) * 0.02 = 9566.67
ml/min; otherwise C.O. = 0.67 * 9566.67 = 6409.67 ml/min
13. Reynolds number = (10 * 1 * 1)/0.01 = 1000 (i.e., it is not considered a turbulent
flow).