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.
Fat (adipose) tissue also produces hormones that regulate metabolism and appetite. Additionally, the term gland does not mean that the organ is part of the endocrine system. For example, sweat glands, glands in mucus membranes, and mammary glands secrete substances other than hormones.ajor Endocrine Glands. Not all organs that secrete hormones or hormonelike substances are considered part of the endocrine system. For example, the kidneys produce the hormone renin to help control blood pressure and the hormone erythropoietin to stimulate the bone marrow to produce red blood cells.