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- (a) As blood passes through the capillary bed in an organ, the capillaries join to form venules (small veins). If the blood speed increases by a factor of 4.00 and the total cross-sectional area of the venules is 10.0 cm2, what is the total cross-sectional area of the capillaries feeding these venules? (b) How many capillaries are involved if their average diameter is 10.0 m?Angioplasty is a technique in which arteries partially blocked with plaque are dilated to increase blood flow. By what factor must the radius of an artery be increased in order to increase blood flow by a factor of 10?Determine the erythrocyte sedimentation rate assuming that the erythrocytes have a spherical shape with a diameter of 8 microns. Take the blood density 1060 kg/m3, the density of the substance of erythrocytes 1090 kg/m3.
- (a) Find the average time required for an oxygen moleculeto diffuse through a 0.200-mm-thick tear layer on the cornea.(b) How much time is required to diffuse 0.500 cm3 ofoxygen to the cornea if its surface area is 1.00 cm2 ?The human circulation system has approximately 1X109 capillary vessels. Each vessel hasa diameter of about 8μm. Assuming cardiac output is 5L/min, determine the averagevelocity of blood flow through each capillary vessel.L (a) The heart pumps blood into the aorta at a rate of 4 . Calculate the average speed of blood if min the aorta's diameter is 2.1 cm. 1155 V blood cm S (b) The aorta branches many times until the blood finally reaches the smallest branch: the capillaries. Each capillary has an average diameter of 6.9 μm and the blood slows down to 0.5 the number of capillaries in the body. Does this answer look reasonable? mm Calculate . S n 1840 caps capillaries (c) For what duration of time is a red blood cell in a capillary if the average capillary length is 1 mm? t = 0.0867 S
- The approximate inside diameter of the aorta is 0.49 cm; that of a capillary is 12 μm. The approximate average blood flow speed is 1.0 m/s in the aorta and 1.0 cm/s in the capillaries. If all the blood in the aorta eventually flows through the capillaries, estimate the number of capillaries in the circulatory system. capillariesThe approximate inside diameter of the aorta is 0.49 cm; that of a capillary is 8 µm. The approximate average blood flow speed is 1.0 m/s in the aorta and 1.0 cm/s in the capillaries. If all the blood in the aorta eventually flows through the capillaries, estimate the number of capillaries in the circulatory system.capillariesQ1. a) In an adult, the aorta’s radius is normally 1.5 cm and blood moves through it at the average velocity of 30 cm/s. If a typical capillary vein has a constant radius of 5 x10-6m andblood passes through them with a velocity of 0.1 cm/s, approximately how many capillaries areneeded in a body? b) Benzene at 1 atm and 80⁰C enters the pipe system given in the below figure, with a Reynoldsnumber of 130000 and leaves the system at 60⁰C. Assuming that diameters of the pipes at theexit are equal to each other, calculate the Reynolds number on one of the exit pipes (density ofliquid benzene at 80⁰ C= 813 kg/m3and at 60⁰C = 835 kg/m3).
- The primary organs of the respiratory system are the _____, which carry out this ecchange of gases as you breathe. Inhaling moves the diaphragm______and expands the _______.When you _______ the diaphragm relaxes. The diaphragm and ribs return to their original place.(a) Find the average time required for an oxygen molecule to diffuse through a 0.200-mm-thick tear layer on the cornea. (b) How much time is required to diffuse 0.500 cm3 of oxygen to the cornea if its surface area is 1.00 cm2?L (a) The heart pumps blood into the aorta at a rate of 4 the aorta's diameter is 2.1 cm. Calculate the average speed of blood if min V blood = cm S (b) The aorta branches many times until the blood finally reaches the smallest branch: the capillaries. Each capillary has an average diameter of 6.9 μm and the blood slows down to 0.5 the number of capillaries in the body. Does this answer look reasonable? mm Calculate . S n = caps capillaries (c) For what duration of time is a red blood cell in a capillary if the average capillary length is 1 mm? t = (d) Why does the blood need to flow much slower through the capillaries than the aorta? ○ A. The capillaries are thin and might burst. ○ B. There must be sufficient time for the exchange of substances to occur across the cell membrane of the capillaries. O C. There is a smaller cross-sectional area. ○ D. None of these.