carry deoxygenated blood to the heart [except pulmonary veins]; veins, with the exception of the pulmonary vein, carry blood that has been used by body tissues, back to the heart; veins carry blood and waste products to the heart where these will be processed through the lungs and given oxygen again.rtery Structure. arteries have three layers: a smooth inner layer; a strong, muscular layer; and a thin outer layer; connective fibers in artery walls allow for the elasticity needed for the artery to function; arteries are usually larger than veins.
Asker's rating. 1  Cl- has the smallest radius due to the fact that atoms' radii get smaller as you go up and to the right in the periodic table. 2  F- has the smallest radius. 3  Sice flourine is in the lowest energy level so it has the lowest radius. 4  fluorine.
No, Earth isn't the smallest planet. Earth is the fifth largest planet in our Solar System. It is larger than all the other inner (or 'Rocky') planets (Venus, Mars and Mercuâ¦ry) but smaller than the 4 outer planets (Jupiter, Saturn, Uranus and Neptune) . Mercury is the smallest planet despite the fact that a multitude of smaller objects orbit the Sun.