Question 4 The capillary surface area of a child 10 years old is 1.14 m2, of...

Question 4

The capillary surface area of a child 10 years old is 1.14 m2, of an adult woman is 1.6 m2, and of an adult, man is 1.9 m2. The pulmonary blood volume per area is 271 ml/m2. Capillary blood volume varies between 20% and 25% of the pulmonary blood volume.

a) Assuming capillaries are 8 um in diameter and have an average length of 1 mm, calculate the range of the number of open capillaries in the lung during rest for a child of 10 years of age, an adult woman, and an adult man during rest.

[13 marks]
b) After exercise the pulmonary blood volume doubles due to vasodilation, and there is capillary recruitment of 100%. Calculate the number of capillaries perfused in the lungs during exercise. Justify your answer.

[6 marks]
c) What can you conclude from these estimates?

[6 marks]

Expert Solution

Ans Normally the pulmonary capillaries have the diameter of 6m we are assuming 8m in diameter which greater than the average diameter of pulmonary capillaries and average length is of 600microns now the conditon is that if there is flow of blood through 8m and average length of 1mm blood flow is not flow properly as compare to normal pulmonary blood flow because of diameter is larger than the average as compare to boy capillary surface area is 1.14m2 and normal surface area is 800 to 900m2 which is larger than 6 times thats why proper flow is not through this condition

same condition also applicable for women and adult man because of normal area is 800 to 900 m2

after during exercise the pulmonary blood flow of volume is more because heart pump blood during stenous exercise and during exercise tidal volume of lung increases and depth of breathing also increases

conclusion is from above that during exercise pulmonary blood volume and breathing also increase because at this time heart pump more blood and lung circulate this blood to organs

Sydney Mullin answered 1 year ago

A rectangular box with no top is to have a surface area of 64 m2. Find the...

A rectangular box with no top is to have a surface area of 64 m2. Find the dimensions (in m) that maximize its volume. I got width as X= 8sqrt3/3, length y=8sqrt3/3, and height as z=4sqr3/3 but it is wrong and I don't know why

An airplane has an effective wing surface area of 19.0 m2 that is generating the lift...

An airplane has an effective wing surface area of 19.0 m2 that is generating the lift force. In level flight the air speed over the top of the wings is 55.0 m/s, while the air speed beneath the wings is 35.0 m/s. What is the weight of the plane?

Consider a lake with 65 × 106 m2 of surface area for which the only source...

Consider a lake with 65 × 106 m2 of surface area for which the only source of phosphorous is the effluent from a wastewater treatment plant. The lake is receiving a flow rate of 1 m3/s from the wastewater treatment plant, which has a phosphorous concentration of 20 mg/L. The lake is also fed by a stream having 20 m3/s of flow with no phosphorous in it. If the phosphorous settling rate is estimated to be 10 m/yr. (a) Write...

An 80-kg person whose surface area is 1.30 m2 worked for one hour at a distance...

An 80-kg person whose surface area is 1.30 m2 worked for one hour at a distance of 2.0 meters from a spherically-symmetric source of radiation whose output power is 0.35 W. What dose (in rads) did he receive?

A plane of area 0.25m2and surface charge density s=4.5 nC/m2 lies in the x = 0.00...

A plane of area 0.25m2and surface charge density s=4.5 nC/m2 lies in the x = 0.00 m plane, and a second plane of surface charge density s= -4.50 nC/m2 lies in the x = 0.0200 m plane. Find:a.find the capacitance, the stored charge, and the potential energy of the system. b.the electric potential difference between the 2 planes.c.the electric field at (i) x = 0.0180 m and (ii) x = 0.0500 m (508 N/C and 0 N/C). d.What is the...

Explain PCR to 10 years old child with all details.. i need where it is used,...

Explain PCR to 10 years old child with all details.. i need where it is used, what type knowledge we can learn on pcr samples, how does it work please give me a long text thx

Question 4 In capillary beds, there is mass movement of fluids and molecules into and out...

Question 4 In capillary beds, there is mass movement of fluids and molecules into and out of capillary beds. For movement of fluids, simple diffusion is not sufficient and two pressure-based mechanisms are utilized. Describe the action of the competing forces driving filtration of fluids in a capillary bed. Describe the action of the competing forces driving reabsorption of fluids in a capillary bed. Predict how physiological changes in the capillary beds in response to an increase in body temperature...

Question: Your father is 50 years old and will retire in 10 years. He expects to...

Question: Your father is 50 years old and will retire in 10 years. He expects to live for 25 years after he retires, until he is 85. He wants a fixed retirement income that has the same purchasing power at the time he retires as $45,000 has today. (The real value of his retirement income will decline annually after he retires.) His retirement income will begin the day he retires, 10 years from today, at which time he will receive...

A steel wire with a cross-section area 2.5X10^-3 m2 and a length of 10 m is...

A steel wire with a cross-section area 2.5X10^-3 m2 and a length of 10 m is used to pull a truck on the road. The truck is 10 tons and the friction coefficient between the tires and road is 0.25N/kg. Steel has a Young’s modulus 250MPa. Suppose this wire contain surface cracks. Determine the largest linear size of the surface crack so that the wire will not fail due to fracture in this application. Kc = 0.1 MPa m^0.5

A cylinder of 10-m-high, and a cross-sectional area of 0.1 m2 , has a piston (that...

A cylinder of 10-m-high, and a cross-sectional area of 0.1 m2 , has a piston (that is free to move) assumed to have negligible mass and thickness (see Figure 1(a)). Above the piston there is a liquid that is incompressible (constant density and volume) with ρliquid = 1000 kg/m3 . Below the piston there is air at 300 K, with a volume of 0.3 m3 . Assume air is an ideal gas (Ru =8.314 J.mol-1 .K-1 ; Mair = 28.9628...

Question