Wait a second!
More handpicked essays just for you.
More handpicked essays just for you.
Don’t take our word for it - see why 10 million students trust us with their essay needs.
Recommended: Endocrine system
The endocrine system is a collection of glands in the body that help to control bodily metabolic activity by producing endocrine secretions. Although there are many glands in the endocrine system the main glands include the pancreas, ovaries, testes, kidneys, thyroid gland, parathyroid gland, adrenal glands, pineal gland, gastrointestinal tract, hypothalamus and pituitary gland. Functions Hypothalamus – The hypothalamus is located in the brain. It is responsible for direct control over the entire endocrine system through the pituitary gland. Cells in the hypothalamus called neurosecretory cells secrete 7 hormones – Thyrotropin-releasing hormone (TRH), Growth hormone-releasing hormone (GHRH), Growth hormone-inhibiting hormone (GHIH), Gonadotropin-releasing hormone (GnRh), corticotropin-releasing hormone (CRH), oxytocin and Antidiuretic hormone (ADH). GHRH and GHIH regulate the release of the growth hormone as GHRH releases it and GHIH inhibits it. CRH stimulates the release of the adrenocorticotropic hormone. GnRH stimulates the release of follicle stimulation hormone and the luteinizing hormone. THR stimulates the release of the thyrotropin hormone. Oxytocin and ADH are both transported to the posterior pituitary gland to be stored and release later when they are needed. Pancreas – The pancreas is located deep in the abdomen. The function of the pancreas in the endocrine system is to produce two hormones called insulin and glucagon. These two hormones maintain balance (homeostasis) in the blood sugar. The insulin produced enables the glucose that is created from the breakdown of carbohydrates to be used in the cells as energy. Glucagon raises the glucose level in the blood. Ovaries – Located in front of the ureters in a fem... ... middle of paper ... ...auses the thyroid to produce thyroxine and triiodothyroninie. 2) Adrenocorticotropic hormone (ACHT) which is responsible for stimulating the adrenal cortex. This then means the outer part of the adrenal cortex is stimulated and produces its hormones. 3) Prolactin (PRL) which is responsible for stimulating the mammary glands located in the breasts to produce milk. 4) Human Growth Hormone (HGH) which affects many target cells and stimulates their reproduction, growth and repair. 5) Follicle stimulating hormone (FSH) which is responsible for the stimulation of follicle cells found in the gonads. This encourages either the testes to produce sperm and the ovaries to produce ova. 6) The luteinizing hormone (LH) is also responsible for stimulating the gonads. However, this hormone stimulates them to create the sex hormones – oestrogen in women and testosterone in men.
The location of the pituitary gland is in the sella turcica of the sphenoid bone and attaches to the hypothalamus(Marieb & Hoehn 441). The Hypothalamus is included in the function of the pituitary gland as it sends chemical stimulus to it(Marieb & Hoehn 442).Part of the pituitary is called the “ master endocrine gland” due to the fact that is produces many hormones that affect the whole body(Shannon 175).This part of the pituitary gland is called the anterior pituitary(Marieb & Hoehn 601). There are six hormones that the anterior pituitary secretes normally. These Hormones are growth hormones,thyroid stimulating hormones,adrenocorticotropic hormones,luteinizing hormones,follicle stimulating hormones and prolactin hormones( Shannon 175).The Hormone prolactin is one that in normal function stimulates the act of lactation for new mothers to feed their baby(Shannon 175).
CAH is an autosomal recessive genetic disorder and males and females are affected in equal numbers. Chromosome 6 is where the group of genes lie that causes the most common forms of CAH. Adrenocorticotropic hormones (ACTH) are released by the anterior lobe in the pituitary gland. Its role is to act on cells of the adrenal cortex which then synthesizes corticosteroids and cortisol. However, those with CAH have insufficient amounts of the enzyme 21-hydroxylase, needed to convert 17-hydroxyprogesterone (17-OHP) into cortisol.
Adrenocorticotropic hormone (ACTH): a hormone produced in pituitary gland that targets the adrenal cortex to release corticol
The physiological activity of different hormones depends on its concentration within the circulatory system. The effects of too high or too low a concentration can be damaging and this level must be controlled. The endocrine system relies on negative and positive feedback systems to regulate hormone production and secretion.
Endocrinology can be defined as the study of the structure and function of the endocrine system (Tortora & Grabowski 1996). The endocrine system is composed cells, known as endocrine cells, which are distributed around the body and produce the chemical messengers known as hormones. Following secretion by endocrine cells, hormones travel in the blood where they affect tissues outside of their tissue of origin - and are therefore a form of cellular communication. In multicellular organisms, such as humans, cellular communication is essential for a number of body processes and the maintenance of homeostasis (Campbell, N.A. et al. 2015). In this essay, I am going to outline some of a number of body
Hormones are one major parts of the endocrine system. They are released from endocrine tissue into the bloodstream. As the hormones travel through the bloodstream they target a tissue where they will start a response. The endocrine glands, which are a special group of cells, make hormones. Endocrine glands usually do not have ducts and are vascular. The kidney, heart, and liver help secondary endocrine systems. A small change in hormones can cause big changes in the body and in cells. If there are too many or to...
There are three patterns that regulate hormone secretion; Non-hormonal, neuronal, and Hormonal. In Non-hormonal, the release of a hormone is dependent on the amount of another substance that is not a hormone. For instance, if the concentration of glucose in the blood stream is to low the pancreases with release glucagon which causes the liver to convert glycogen to glucose. Neuronal is the regulation of hormones based on the emotions and stress a person feels. A common example of this is adrenalin (epinephrine) which is the fight or flight hormone. Finally, there is Hormonal with is regulated by other hormones. An example of this would be any releasing hormone produced by the Hypothalamus that causes the release of Tropic hormones from the anterior pituitary gland.
Sharpe, Richard M. and Niels Skakkebaek. 1993. Are oestrogens involved in falling sperm counts and disorders of the male reproductive tract? Lancet
The endocrine system interacts with the nervous system to coordinate and integrate the activity of body cells. Unlike the nervous system, which sends signals chemically and electrically, the endocrine system sends signals only via chemical stimulants called hormones. These hormones are secreted by the cells into any extracellular fluids, which then travel through the blood to regulate any metabolic activity. Hormones have a diverse and widespread affect like controlling reproduction, growth, development, maintaining nutrient balance in the blood, regulating cellular metabolism and mobilizing the body defenses (Marieb et al 2013). In dealing with growth and development, the thyroid gland is always under consideration. The thyroid gland is the largest endocrine gland in the body that produces thyroid hormones that consist of two iodine-containing hormones called thyroxine (T4) and triiodothyroxine (T3) (Marieb et al 2013). Thyroid-stimulating hormones (TSH) are a tropic hormone that stimulates normal development and secretory activity of the thyroid gland. Thyrotropin-releasing hormones (TRH) are hypothalmic peptides that trigger the release of TSH from thyrotropic cells to different organs to help maintain the body’s metabolic state (Marieb et al 2013). Thyroid function has been known as a major contributor to the basal metabolic rate (O’Malley et al 2000). According to Longhi and Radetti, body composition and thyroid hormones are two components that are closely related. The hormones are involved in regulation of metabolism and thermogenesis, which plays a key role in lipid and glucose metabolism along with digestion of food and fat oxidation (Longhi et al 2013).
The anterior pituitary is an endocrine gland controlled by the hypothalamus in several different fashions. Releasing and release-inhibiting hormones are synthesized in the paraventricular, periventricular, and the supraoptic nuclei of the hypothalamus. They control anterior pituitary hormone secretion. Paravocellular neurons in these nuclei send their axons into the tuberoinfundibular tract and terminate on a capillary bed of the superior hypophyseal arteries located around the base of the median eminence. A given paravocellular neuron may release one or more releasing factor into the capillaries that coalesce in six to ten small straight veins that form the hypophyseal-portal blood circulation which descends along the infundibular stalk and forms a second capillary plexus around the anterior pituitary. The releasing-hormones gain access to the five distinct types of target cells in the anterior pituitary back into the capillary bed that then drains into the systemic circulation and transports the hormones to peripheral target tissues. The target tissues are stimulated to produce final mediator-hormones that induce the physiologic...
The endocrine system consists of six parts; pancreas hypothalamus, thyroid, pituitary gland, ovary, and adrenal gland. The pancreas is a large gland that produces hormones that regulate blood sugar; produces enzymes that break down carbohydrates, lipids, proteins, and nucleic acids; and produces sodium bicarbonate, a base that neutralizes stomach acid. The hypothalamus is a brain structure that acts as a control center for recognition and analysis of hunger, thirst, fatigue, anger, and body temperature. The thyroid is a large gland in the neck that secretes (produces) hormones regulating growth through the rate of metabolism. The pituitary gland is in the base of the skull that secretes nine hormones that directly regulate many body functions and control the actions of several other endocrine glands. The ovary ( found in females) is a gonad that produces eggs. The adrenal glands are a pair of glands located above the kidneys, which produces epinephrine and norepinephrine. The endocrine system main function is to release hormones that affect activities of other cells.
The thyroid gland is part of the endocrine system, and it is controlled by the pituitary which is known as the “master gland” of the endocrine system. The pituitary controls the thyroid by producing Thyroid Stimulating Hormone (TSH) which stimulates the production of thyroid hormones. . The thyroid gland secretes two main hormones: Thyroxine (T4) and Tri-Iodothyronine (T3). These hormones increase metabolic rate, heat production, oxygen consumption, appetite, growth hormone secretion, alertness and quicker reflexes. The thyroid gland is located in the anterior portion of the neck, beneath the Adam’s apple. It is divided in two lobes on either side of the windpipe: right lobe and left lobe. These lobes create what looks like a butterfly shape. The gland is essential to the contribution of maintaining the homeostasis of the body. It plays a role in monitoring the body’s expenditure of energy and running the body’s metabolism.
Swan, S.H., F. Liu, J.W. Overstreet, C. Brazil, and N.E. Skakkebaek. "Growth Hormones Fed to
Hypothalamus – master system for endocrine system and releases or inhibits hormones to be in charge of the pituitary gland
The male reproductive system is a set of organs that works together to produce sperm which will later in life fertilize females eggs. The testes are the most important part of the system because it produces sperm cells. It is similar and looks similar to ovaries of a female’s reproductive system because it also holds what they need to reproduce. Its job is to produce the sperm cells needed to reproduce. Due to hormonal imbalances the production of sperm cells may not even be possible in some males. Testosterone is the male the hormone that gives men there manly characteristics. It is made up of hydrogen, carbon, and oxygen with a white color. In the male body it helps develop sex organs, a deeper voice, and facial hair (Khalid, 2013). Cancer or a genetic disorder in males is the most common thing that cause the reductions of testosterone production in the body. Behind the testes is the epididymis which lets sperm go through the vas deferens from the testes (Dictionary, 2014). It looks like leach the way it is position right on the testes but it is thinner. When sperm is produces the ...