(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 $10.0 \mathrm{cm}^{2},$ 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$\mu \mathrm{m} ?$