The pressure difference across the wall of a blood vessel is called transmural pressure. Suppose an aorta of radius \(11 \mathrm{~mm}\) has a transmural pressure of \(12 \mathrm{kPa}\) and a capillary of radius \(4.0 \mu \mathrm{m}\) has a transmural pressure of \(5.0 \mathrm{kPa}\). Which blood vessel requires a greater tensile stress (tensile force per unit length) in its wall?