The average blood velocity in a particular blood vessel is inversely
proportional to the total cross-sectional area of the blood vessel. If the crosssectional area of your aorta is 0.45 cm2 and of your capillary bed supplying your
skeletal muscles is 4500 cm2, and you have a 5 L blood volume and a cardiac
output of 5 L/min, during one second of blood flow how far will a blood cell
move through your aorta and capillary bed?
If the average capillary length is 0.5 mm, how long does it take for this
blood cell to completely pass through? If your aorta is 1 m in length, how long
does it take for this blood cell to completely pass through?
During exercise your cardiac output increases 3-fold, how will this affect
the length of time the blood cell spends in the capillary? What effect will this
have on capillary exchange of O2 and CO2?
If O2 concentration in arterial blood is 200 ml/L, in venous blood 150 ml/L,
how much O2 is delivered to a capillary bed of 0.55 mm length with a crosssectional area of 4500 cm2 during 1 sec. of arterial blood flow assuming a cardiac
output of 4.8 L/min?