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A hormone is a chemical compound which is secreted by a gland into the blood and it is carried through blood to a distant site where it acts. Hormones can be divided into five major classes: (1) amino acid derivatives such as dopamine, catecholamines, and thyroid hormone; (2)small neuropeptides such as gonadotropin-releasing hormone (GnRH), thyrotropin-releasing hormone (TRH), somatostatin, and vasopressin; (3) large proteins such as insulin, luteinizing hormone (LH), and PTH produced by classic endocrine glands; (4) steroid hormones such as cortisol and estrogen that are synthesized from cholesterol-based precursors; and (5) vitamin derivatives such as retinoids (vitamin A) and vitamin D. A variety of peptide growth factors, most of which act locally, share actions with hormones. As a rule, amino acid derivatives and peptide hormones interact with cell-surface membrane receptors. Steroids, thyroid hormones, vitamin D, and retinoids are lipid-soluble and interact with intracellular nuclear receptors.
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What is the definition of a birth control pill?
A pill containing female sex hormones which is used to prevent contraception.
What is the definition of petting a pet?
Stroking or cuddling the pet. This releases "feel-good" hormones in both the pet and the petter.
What is a easy definition of steroids?
Any of various hormones having the structure of a steroid that are made synthetically, especially for use in medicine
Do hormones travel through the blood stream?
Hormones travel In the blood because they need to travel in the body.
Definition of tropic hormone?
Tropic hormones are hormones that regulate the secretion of other hormones from endocrine glands. They act on target glands to stimulate or inhibit the release of specific hormones, which then exert effects on various tissues and organs in the body. Examples include thyroid-stimulating hormone (TSH) and adrenocorticotropic hormone (ACTH).
What is the definition of hyperactivity?
Hyperactivity is when there is too much muscle activity. It could also be when a part of your body is too active, such as producing too many hormones.
What is the definition of the word ovulation?
Ovulation is the production of the ova, and the nature of discharging eggs from the ovary due to the production of hormones in the pituitary gland during the menstrual cycle.
What are hormones carried in to their target cell?
Hormones are typically carried in the bloodstream to their target cells. Once the hormone reaches its target cell, it binds to specific receptors located on the cell membrane or within the cell, triggering a cellular response.
What are topic hormones?
These hormones stimulate the secretion of other hormones. Many hormones of hypothalamus are topic hormones.
The chemical secretions of the endocrine glands are called?
i think is hormones
Definition of endocrine system?
The endocrine system consists of glands that secrete hormones and other products within the body of a living organism (as opposed to the exocrine which secretes externally)
What are hormones made from cholesterol called?
Steroid Hormones
