Womersley number (a) of a human aorta is 20 and for the rabbit aorta is 17, the blood density is approximately the same across the species. The values of viscosity were 0.0035 Ns/m² for the human and 0.0040 Ns/m² for the rabbit. The diameter of the aorta is 2.0 cm for the man, and 0.7 cm for the rabbit, estimate the heart rate beats per minute (bpm) for both species.
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- Medical evidence shows that a small change in the radius of an artery can indicate a large change in blood flow. For example, if one artery has a radius only 5% larger than another, the blood flow rate is 1.22 times as large. Further information is given in the table below. Increase in radius Times greater bloodflow rate 5% 1.22 10% 1.46 15% 1.75 20% 2.07 (a) Use the average rate of change to estimate how many times greater the blood flow rate is in an artery that has a radius 8% larger than another. (Round your answer to three decimal places.)1.364 times greater(b) Explain why if the radius is increased by 8% and then we increase the radius of the new artery by 8% again, the total increase in the radius is 16.64%. x + 8% of xx + 8/100 X xx + 0.08x = 1.08x1.08x + 8% of (1.08x)1.08x + 8/100 X (1.08x)1.08x + 0.0864x = 0.1664x = 16.64% (c) Use parts (a) and (b) to answer the following question: How many times greater is the blood flow rate in an artery that is 16.64%…A child is ordered an infusion of cytarabine 200 mg/m2 in 0.9% NaCl to infuse over 24 hours. If the child weighs 22.7 kg and is 120 cm, how many mg of cytarabine would you add to the 9% NaCl?Blood plasma flows with a rate of 0.4 cm³/s through a tube with a diameter d = 0.18 cm and length 1 = 1.8 m at a temperature of 20°C. The pressure at the tube entrance is P2 = 1.48 x 104 N/m2. If the temperature of the tube and plasma reaches 29°C, what is the tube entrance pressure P2' needed to maintain the flow rate and pressure at the tube exit constant. Consider 120°c = 1.81 mPa·s and n29°c = 1.28 mPa.s.
- Calculate the increase in pressure needed for maintaining the healthy blood flow through the human artery if the radius decreased from 2.0 x 10-4 to 1.8 x 10-4 cm.Blood pressure is usually given as the ratio of the maximum pressure (systolic pressure) to the minimum pressure (diastolic pressure). For example a typical value for this ratio for a human would be 120/70, where the pressures are in mm Hg (millimeters of mercury, SG = 13.6). What would these pressures be in kPa (kilo Pascals)?: (a) systolic pressure (kPa), (b) diastolic pressure (kPa).In the human body, blood vessels can dilate, or increase their radii, in response to various stimuli, so that the volume flow rate of the blood increases. Assume that the pressure at either end of a blood vessel, the length of the vessel, and the viscosity of the blood re- main the same, and determine the factor Ralated/Rpormal by which the radius of a vessel must change in order to double the volume flow rate of the 79. blood through the vessel.
- Explain why mean arterial pressure is not equal to (systolic pressure – diastolic pressure) ÷ 2? Put another way, why is MAP not calculated by taking the traditional arithmetic mean of systolic and diastolic blood pressures?Referring to table 4.1, what is the density of whole blood (in g/ml)? A Moving to another question will save this response.If some tissues could extract all the 02 dissolved in arterial blood so that no 02 remained in venous blood, and if cardiac output were 5500 mL/min, then-according to the Fick principle -the VO2 (oxygen consumption or delivery of dissolved 02 to the tissues ) would be ml/min. The dissolved 02 in blood = 0.3 mL/100 mL blood. -
- A 79 kg man is admitted to hospital following a suspected overdose of drug G. When he is admitted to hospital on the 3rd October at 23:00 his plasma concentration of drug G is 12 mg/mL. Given that the half-life (t½) of drug G is 10.5 hours. What would you expect his plasma concentration of drug G to be at 17:00 on the 5th October? Give the answer in microg/ml. (You may assume that the distribution is complete and the elimination is described by a 1storder process.)The following table shows data on the relationship between a person’s weekly salt intake and his or her systolic blood pressure. a. Plot the data into the graph. (look at table) For plotting, use the orange points (square symbol) to plot the data from the table on the graph. b. Suppose Nick has a weekly salt intake of 11,800 milligrams. Use the black point (X symbol) to plot the point on the graph that most likely corresponds to Nick’s data. Based on the graph you drew, Nick would likely have a systolic blood pressure of ________(options: 120, 115, 125, 105) millimeters of mercury.F2 over the arrow connecting these variables. The slope of this relationship is 0.225 mmHg/(L/min). In the absence of the drug, Xor's blood pressure would drop as low as 70 mmHg. As the blood pressure falls to 70 mm Hg, how much drug should we administer to restore the blood pressure to 105 mmH? To answer this question, assume the following conditions: 1. the drug directly affects the rate of blood flow from the heart (L/min), 2. the drug has no effect at dosages below 41 g and has a linear effect on the rate of blood flow at dosages above 41 g. The slope of this linear effect is 2.91 (L/min) / g of drug, and 3. the drug must increase the rate of blood flow enough to increase the blood pressure from 70 mm Hg to 105 mmHg, and 4. the slope of the linear relationship between the rate of blood flow from the heart and the blood pressure in megaraffes is 0.225 mmHg/(L/min). Our goal is to determine the dosage of the drug needed to increase the blood pressure by 35 mmHg. We'll work backwards…