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Endocrine System
Endocrine System

... necessary hormone. When the hormone levels in the body reaches the required level, the hypothalamus is stimulated by a process called negative feedback; it then stimulates the pituitary to inhibit any further production of the hormone. Clare Hargreaves-Norris ...
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... • controls secretions of some hormones of adrenal cortex • release controlled by corticotropin-releasing hormone (CRH) from the hypothalamus • produced by corticotropes What term would describe these two hormones that cause the secretion of other hormones in distant endocrine tissues? ...
The Endocrine System
The Endocrine System

... control the activities of our body’s cells. This system is usually working closely with the Nervous System. ...
Lecture5
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... Most of the hormones of this gland are steroids (lipids). These hormones fall into the two major groups viz: glucorticoids and mineralocorticoids. (i)Glucoritcoids: The most important members of this group are the cortisol and corticosterone. These hormones promote the conversion of fat and protein ...
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IVA_ Endocrine_System_Chemical_Co_Ordination
IVA_ Endocrine_System_Chemical_Co_Ordination

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Recombinant Human Thyroid Stimulating Hormone
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test review key - Hartland High School

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GONAL-f® (follitropin alfa for injection)
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Copyright (c) 2009, Radiological Society of North America, Inc
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... Serious Warnings and Precautions The Women=s Health Initiative (WHI) trial examined the health benefits and risks of oral combined estrogen plus progestin therapy (n=16,608) and oral estrogen-alone therapy (n=10,739) in postmenopausal women aged 50 to 79 years.1-3 The estrogen plus progestin arm of ...
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Menstrual cycle



The menstrual cycle is the regular natural changes that occurs in the uterus and ovaries that make pregnancy possible. The cycle is required for the production of ovocytes, and for the preparation of the uterus for pregnancy. Up to 80% of women report having some symptoms during the one to two weeks prior to menstruation. Common symptoms include acne, tender breasts, bloating, feeling tired, irritability, and mood changes. These symptoms interfere with normal life and therefore qualify as premenstrual syndrome in 20 to 30% of women. In 3 to 8%, they are severe.The first period usually begins between twelve and fifteen years of age, a point in time known as menarche. They may occasionally start as early as eight, and this onset may still be normal. The average age of the first period is generally later in the developing world and earlier in developed world. The typical length of time between the first day of one period and the first day of the next is 21 to 45 days in young women and 21 to 31 days in adults (an average of 28 days). Menstruation stops occurring after menopause which usually occurs between 45 and 55 years of age. Bleeding usually lasts around 2 to 7 days.The menstrual cycle is governed by hormonal changes. These changes can be altered by using hormonal birth control to prevent pregnancy. Each cycle can be divided into three phases based on events in the ovary (ovarian cycle) or in the uterus (uterine cycle). The ovarian cycle consists of the follicular phase, ovulation, and luteal phase whereas the uterine cycle is divided into menstruation, proliferative phase, and secretory phase.Stimulated by gradually increasing amounts of estrogen in the follicular phase, discharges of blood (menses) flow stop, and the lining of the uterus thickens. Follicles in the ovary begin developing under the influence of a complex interplay of hormones, and after several days one or occasionally two become dominant (non-dominant follicles shrink and die). Approximately mid-cycle, 24–36 hours after the luteinizing hormone (LH) surges, the dominant follicle releases an ovocyte, in an event called ovulation. After ovulation, the ovocyte only lives for 24 hours or less without fertilization while the remains of the dominant follicle in the ovary become a corpus luteum; this body has a primary function of producing large amounts of progesterone. Under the influence of progesterone, the uterine lining changes to prepare for potential implantation of an embryo to establish a pregnancy. If implantation does not occur within approximately two weeks, the corpus luteum will involute, causing a sharp drops in levels of both progesterone and estrogen. The hormone drop causes the uterus to shed its lining in a process termed menstruation. Menstruation also occur in some other animals including shrews, bats, and other primates such as apes and monkeys.
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