FollicleA Follicle is a dry dehiscent fruit which splits on one side only. It may contain one or many seeds. This is the fruit of a Columbine (Aquilegia). Other fruits of this type are: Delphinium (Delphinium), Larkspur (Consolida), Love in a Mist (Nigella damascena), Milkweed (Asclepias), Peony (Paeonia).
The parathyroid glands are small endocrine glands in the neck of humans and other tetrapods that produce parathyroid hormone. Humans usually have four parathyroid glands, variably located on the back of the thyroid gland, although considerable variation exists.Parathyroid hormone and calcitonin (one of the hormones made by the thyroid gland) have key roles in regulating the amount of calcium in the blood and within the bones.The parathyroid glands share a similar blood supply, venous drainage, and lymphatic drainage to the thyroid glands.he parathyroid glands are variable in number: three or more small glands, and can usually be located on the posterior surface of the thyroid gland. Occasionally, some individuals may have six, eight, or even more parathyroid glands.
Thyroxine. (3,5,3â,5â,-tetraiodothyronine), the principal thyroid hormone in vertebrate animals and man, produced by the thyroid follicles. Thyroxine is synthesized by iodination of the amino acid tyrosine and the oxidative condensation of two diiodotyrosine molecules with the splitting off of alanine. hormone secreted by the thyroid gland. Thyroxine (structure 1) is quite similar chemically and in biological activity to triiodothyronine (2). Both are derivatives of the amino acid tyrosine and are unique in being the only iodine-containing compounds of importance in the economy of all higher forms of animal life.