Target tissue refers to the intended site that a hormone will affect such as muscle. Receptor site. Receptor sites are special sites located on every target tissue and only communicate with the specific hormone intended for the target tissue.
What is a target tissue?
Definition: The biological tissue(s) most adversely affected by exposure to a chemical substance.
What is a target tissue in the endocrine system?
Target tissues include the thyroid (thyroiditis), the islets of Langerhans (diabetes), gastric parietal cells (gastritis) and steroid-producing cells in the adrenal and ovary (Addison’s disease) (Lam-Tse et al., 2002).
What makes a tissue a target tissue for a hormone?
All the cells that have receptor sites for a given hormone make up the target tissue for that hormone. In some cases, the target tissue is localized in a single gland or organ. In other cases, the target tissue is diffuse and scattered throughout the body so that many areas are affected.
What are the target organs of hormones?
An example of this is the release of the hormone adrenaline, which is released by the adrenal gland. One of its target organs is the heart, where it increases the heart rate.
Hormones and nerves.
|Effectors||Muscles or glands||Target cells in particular tissues|
|Type of response||Muscle contraction or secretion||Chemical change|
What is a target organ or tissue?
target organ. A tissue or organ upon which a hormone exerts its action; generally, a tissue or organ with appropriate receptors for a hormone.
What is a target cell or tissue?
A target cell responds to a hormone because it bears receptors for the hormone. In other words, a particular cell is a target cell for a hormone if it contains functional receptors for that hormone, and cells which do not have such a receptor cannot be influenced directly by that hormone.
What are the 3 main functions of the endocrine system?
What Does the Endocrine System Do?
- Endocrine glands release hormones into the bloodstream. …
- The endocrine hormones help control mood, growth and development, the way our organs work, metabolism , and reproduction.
- The endocrine system regulates how much of each hormone is released.
What hormone has the most target cells?
Almost all body cells are targets of thyroid hormones. Thyroid hormone increases the overall metabolic rate, regulates growth and development as well as the onset of sexual maturity.
What is the target tissue of melatonin?
The vertebrate pineal organ rhythmically synthesizes and secretes melatonin during nighttime and forms an essential component of the photoneuroendocrine system which allows humans and animals to measure and keep the time. … The suprachiasmatic nucleus appears as a major target of melatonin in mammals.
What are the four characteristics of hormones?
General characteristics of hormones are as follows:
- Hormones are secreted by endocrine cells.
- Hormones are chemical messengers.
- The are chemical signals that circulate in the body fluids.
- The hormones regulate the behavior of the target cells.
- Hormones, unlike enzymes do not catalyze any reaction.
What is an example of a paracrine hormone?
Excellent examples of the paracrine actions of hormones are provided by the ovaries and testes. Estrogens produced in the ovaries are crucial for the maturation of ovarian follicles before ovulation. Similarly, testosterone produced by the Leydig cells of the testes acts on adjacent…
What type of tissue produces hormones?
The endocrine glands secrete hormones into the surrounding interstitial fluid; those hormones then diffuse into blood and are carried to various organs and tissues within the body.
|Endocrine Gland||Associated Hormones||Effect|
|Parathyroid||parathyroid hormone||increases blood Ca2+ levels|
What are the 3 main hormones?
There are three basic types of hormones: lipid-derived, amino acid-derived, and peptide.
What is the most powerful hormone in the body?
DHEA is the highest circulating steroid present in the human body. It does not have much biological effect on its own but is powerful when converted into hormones such as testosterone and estradiol. DHEA is produced from cholesterol by the outer layer of the adrenal glands.
What is the most important hormone in the human body?
Insulin. The hormone insulin is essential for life, regulates many metabolic processes that provide cells with needed energy. Understanding insulin, what insulin does, and how it affects the body, is important to your overall health.