Hormones

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Hormones are organic substances that are secreted by plants


and animals and that function in the regulation of physiological


activities and in maintaining homeostasis. They carry out their


functions by evoking responses from specific organs or tissues


Custom Essays on Hormones

that are adapted to react to minute quantities of them. The


classical view of hormones is that they are transmitted to their


targets in the bloodstream after discharge from the glands that


secrete them. This mode of discharge (directly into the


bloodstream) is called endocrine secretion. The meaning of the


term hormone has been extended beyond the original definition


of a blood-borne secretion; however, to include similar regulatory


substances that are distributed by diffusion across cell


membranes instead of by a blood system.


Among animals, the hormones of the vertebrates--particularly


those of humans and other mammals--are the best known. Most


vertebrate hormones originate in specialized tissues, called


endocrine tissues, and are carried to their targets through the


bloodstream. Endocrine glands. A major endocrine gland in


vertebrates is the pituitary, which consists of two distinct


sections the anterior pituitary (or adenohypophysis) and the


posterior pituitary (or neurohypophysis). The anterior pituitary is


sometimes called the master gland, because it secretes


several hormones that affect the other endocrine glands. For


example, the anterior pituitary hormone thyrotropin and


adrenocorticotropic hormone (ACTH) regulate endocrine activity


in the thyroid and the outer region (cortex) of the adrenal glands,


respectively.


The anterior pituitary also secretes hormones that affect the sex


glands. One of these is follicle-stimulating hormone (FSH),


which stimulates egg production in the ovaries and sperm


production in the testes. Another is luteinizing hormone (LH). In


females, LH works in conjunction with FSH to regulate the


female reproductive cycle and the secretion of female sex


hormones. In males, LH controls the production of the male sex


hormones. Other hormones produced in the anterior pituitary


include growth hormone, which is responsible for normal body


growth, and prolactin, which promotes milk production in female


mammals. Its designation as the master gland notwithstanding,


the anterior pituitary itself is regulated by substances called


releasing hormones that are secreted by the hypothalamus, the


part of the brain located directly above the pituitary.





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