Question

21.3 HEMODYNAMICS: FACTORS AFFECTING BLOOD FLOw 815 proteins in plasma. The higher the blood's viscoily.the higher the resistance. Any condition that increases the visoityo ch as dehydration or polycythemia (an onosual -A hlood cellis), thus increases blood pressun blood presssure has dropped to about in blood cells, dac to a whose weight is 160 pounds has a total length of blood vessels equal to 70,000 miles. If he ains 1 pound of fat, his fat tissue will grow an extra 7 miles of blood vessels. (12 points) How much will his resistance to b a. sume his blood viscosity and blood vessel radius remain the same. Ass lood flow/R) Increase if he gains 10 pounds? (6 points) Calculation: His resistance to blood flow will increase by Assuming his mean arterial pressure (MAP) is the same cardiac output) if he gains 10 pounds? Calculate to the nearest 10°.(6 points) Calculation: b. _ times. 95 mmHg, what will his MAP be (to maintain His MAP If a blood thinner can reduce blood viscosity by 20%, to maintain the same cardiac output, (10 points) How would his resistance to blood flow change? (increase or decrease) (2 points) a. b. By what percentage will the resistance to blood flow change? (2 points) If his mean arterial pressure (MAP) is 120 mmHg before taking the blood thinner, what wil his MAP be if he is on this blood thinner? (6 points) Calculation: c. His MAP will bemmHg radius of the aorta is 1.2 cm, and the radius of a large arteriole is 0.002 cm.(14 point) a. Calculate the ratio of resistance to blood flow R(arteriole)/R(aorta).Write your answer in scientific notation (nx10"). (8 points)

Answer 1

3.a. resistance is directly proportional to increase in length of blood vessel

Increase in length of blood vessel is 70 miles which is 0.1 time increase

Therefore 0.1 time increase in resistance

b.MAP Change is 95*0.1= 9.5

New MAP is 104.5mmHg

4.a.resistance to flow decreases with decrease in viscosity

B.resistance to blood flow will change by 20%

C.MAP is 1.2(120)= 144mmHg