The radiation pattern. depends on the number and the type of elements be-. ing used, and the physical and electrical structure of. the array. Numerous variations of antenna structures, as well as the type of elements are available, but for. simplicity only one kind of element is used in the. whole array structure [2].
However, organ is a group of organized tissues performing specific or group of functions. â¢ Gland always secretes substances but not all the organs secrete substances. â¢ Gland is always a tubelike structure but organ is not always in that nature. Ex: liver is a dense organ but stomach is a hollow organ.
Endocrine glands do not form ducts and release their products directly into the blood. As a result, glands can be classified by whether or not they have a duct. Another difference between endocrine and exocrine glands is that exocrine glands are usually much simpler and easier to categorize than endocrine ones.Although they are often made up of multiple cells, exocrine glands may be as small as a single cell.ndocrine glands do not form ducts and release their products directly into the blood. As a result, glands can be classified by whether or not they have a duct. Another difference between endocrine and exocrine glands is that exocrine glands are usually much simpler and easier to categorize than endocrine ones.