Medical Definition of afferent. : bearing or conducting inward; specifically : conveying impulses toward the central nervous systemâcompare efferent.
Imperial Weight Units. The imperial system of weights, or more correctly the avoirdupois system of weights is the standard system of weight in the United States and is still in common usage in the United Kingdom. The system is based on a pound (lb) of 16 ounces (oz).
Both ounces and pounds are units of weight in the imperial metric system. They are most closely comparable to grams and kilograms in the metric system. There are approximately 28 grams in a single ounce, which is equal to 0.028 kilograms. Note that there are 16 U.S. ounces in 1 U.S. pound. Different countries had different sized ounces and pounds in the past when they used the imperial system.