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.
What is the difference between the endocrine gland and the exocrine gland? Endocrine gland is a gland whose secretions (called hormones) are collected by the blood and reach the tissues through the circulation. The hypophysis (pituitary) and the adrenals are examples of endocrine glands. Exocrine gland is a gland whose secretions are released externally through ducts (into the skin, intestinal lumen, mouth, etc.). The sebaceous glands and the salivary glands are examples of exocrine glands.