A heart pumps blood at a rate of 1.8 x 103 cm3/min though its aorta is of crosssectional area 0.6 cm2. The blood spreads into a capillary network that is equivalent to about 4 x 105 fine tubes each of diameter 6 x 10'3 cm. (a) Blood is often described as an ideal fluid. Describe two properties of a fluid which make it an ideal fluid (b) Determine the average velocity of blood in the aorta (c) Calculate the average blood velocity in the capillary tubes. (d) Comment on the pressure differences between the aorta and capillary tubes. During a heart angioplasty the blood flow rate through the main pulmonary artery is cut in half. (e) Write an expression for which relates the flow rate ofthe blood to the velocity of the blood. (f) How will the reduction in blood flow rate affect the time required for the blood to make it all through the main pulmonary artery