| 单词 | anterior pituitary |
| 例句 | A negative feedback system occurs in the male with rising levels of testosterone acting on the hypothalamus and anterior pituitary to inhibit the release of GnRH, FSH, and LH. Concepts of Biology 2013-04-25T00:00:00Z These travel from the hypothalamus through the hypophyseal portal system to the anterior pituitary where they exert their effect. Biology for AP Courses 2022-06-09T00:00:00Z Epinephrine and norepinephrine are secreted by the adrenal medulla and play a role in the fight-or-flight response, whereas dopamine is secreted by the hypothalamus and inhibits the release of certain anterior pituitary hormones. Anatomy and Physiology 2013-06-19T00:00:00Z The anterior pituitary is in the closest relation and contact with them. The Glands Regulating Personality The anterior pituitary is composed of glandular cells that secrete protein hormones. Biology for AP Courses 2022-06-09T00:00:00Z The anterior pituitary receives signals from the hypothalamus and produces six hormones. Concepts of Biology 2013-04-25T00:00:00Z During adolescence, gonadotropic hormones from the anterior pituitary cause the activation of these cells and the production of viable sperm. Biology for AP Courses 2022-06-09T00:00:00Z Interestingly, children have higher melatonin levels than adults, which may prevent the release of gonadotropins from the anterior pituitary, thereby inhibiting the onset of puberty. Anatomy and Physiology 2013-06-19T00:00:00Z The masculine pituitary personality, the man with a dominant anterior pituitary gland in a roomy sella turcica with plenty of space to grow in, is the ideal virile type. The Glands Regulating Personality Increased levels of these hormones result in feedback to the hypothalamus and anterior pituitary to inhibit further signaling to the thyroid gland. Biology for AP Courses 2022-06-09T00:00:00Z Starting at adolescence, anterior pituitary hormones cause the development of a few follicles in an ovary each month. Concepts of Biology 2013-04-25T00:00:00Z At adolescence, anterior pituitary hormones cause the development of a number of follicles in an ovary. Biology for AP Courses 2022-06-09T00:00:00Z The hypothalamus is the executive region in charge of the autonomic nervous system and the endocrine system through its regulation of the anterior pituitary gland. Anatomy and Physiology 2013-06-19T00:00:00Z The masculine pituitary type is one determined by the rule of the anterior pituitary, representing superlative brain tone and action, good all-around growth and harmonious general function, the ideal masculine organism. The Glands Regulating Personality For example, the anterior pituitary signals the thyroid to release thyroid hormones. Biology for AP Courses 2022-06-09T00:00:00Z As with the male, the GnRH from the hypothalamus causes the release of the hormones FSH and LH from the anterior pituitary. Concepts of Biology 2013-04-25T00:00:00Z The human male and female reproductive cycles are regulated by the interaction of hormones from the hypothalamus and anterior pituitary with hormones from reproductive tissues and organs. Biology for AP Courses 2022-06-09T00:00:00Z These reflexes may be simple, involving only one hormone response, or they may be more complex and involve many hormones, as is the case with the hypothalamic control of various anterior pituitary–controlled hormones. Anatomy and Physiology 2013-06-19T00:00:00Z Now the primary determinant, catalyst or sensitizer of the growth of the long bones is the anterior pituitary. The Glands Regulating Personality The anterior pituitary in turn releases hormones that regulate hormone production by other endocrine glands. Biology for AP Courses 2022-06-09T00:00:00Z The anterior pituitary produces six hormones: growth hormone, prolactin, thyroid-stimulating hormone, adrenocorticotropic hormone, follicle-stimulating hormone, and luteinizing hormone. Concepts of Biology 2013-04-25T00:00:00Z As with the male, the anterior pituitary hormones cause the release of the hormones FSH and LH. Biology for AP Courses 2022-06-09T00:00:00Z The hormones secreted by the posterior and anterior pituitary, and the intermediate zone between the lobes are summarized in Table 17.3. Anatomy and Physiology 2013-06-19T00:00:00Z Concomitantly, there is a changed, a more matured and steadier outlook upon life, all due to stimulation of the anterior pituitary, controller of growth, physical and mental. The Glands Regulating Personality It synthesizes and secretes regulatory hormones that control the endocrine cells in the anterior pituitary gland. Biology for AP Courses 2022-06-09T00:00:00Z The male and female reproductive cycles are controlled by hormones released from the hypothalamus and anterior pituitary and hormones from reproductive tissues and organs. Concepts of Biology 2013-04-25T00:00:00Z The decrease in progesterone also allows the hypothalamus to send GnRH to the anterior pituitary, releasing FSH and LH and starting the cycles again. Biology for AP Courses 2022-06-09T00:00:00Z However, the secretion of hormones from the anterior pituitary is regulated by two classes of hormones. Anatomy and Physiology 2013-06-19T00:00:00Z The anterior gland and the thyroid arise from almost the same spot in the embryonic oesophagus, the thyroid being an outgrowth in front, the anterior pituitary an outgrowth behind of the same soil. The Glands Regulating Personality The pituitary has two distinct regions—the anterior pituitary and the posterior pituitary—which between them secrete nine different peptide or protein hormones. Biology for AP Courses 2022-06-09T00:00:00Z The hypothalamus monitors the need for FSH and LH production and release from the anterior pituitary. Concepts of Biology 2013-04-25T00:00:00Z When the baby begins suckling at the breast, signals are sent to the hypothalamus causing the release of prolactin from the anterior pituitary. Biology for AP Courses 2022-06-09T00:00:00Z These hormones—secreted by the hypothalamus—are the releasing hormones that stimulate the secretion of hormones from the anterior pituitary and the inhibiting hormones that inhibit secretion. Anatomy and Physiology 2013-06-19T00:00:00Z In castrates there is an increase in the size and number of the cells of the anterior pituitary, again a compensation or substitution effect. The Glands Regulating Personality This capillary network is a part of the hypophyseal portal system that carries substances from the hypothalamus to the anterior pituitary and hormones from the anterior pituitary into the circulatory system. Biology for AP Courses 2022-06-09T00:00:00Z While these hormones are produced by the anterior pituitary, their production is controlled by regulatory hormones produced by the hypothalamus. Biology for AP Courses 2022-06-09T00:00:00Z The hypothalamus monitors the need for the FSH and LH hormones made and released from the anterior pituitary. Biology for AP Courses 2022-06-09T00:00:00Z Hypothalamic releasing and inhibiting hormones travel through a primary capillary plexus to the portal veins, which carry them into the anterior pituitary. Anatomy and Physiology 2013-06-19T00:00:00Z These regulatory hormones can be releasing hormones or inhibiting hormones, causing more or less of the anterior pituitary hormones to be secreted. Biology for AP Courses 2022-06-09T00:00:00Z Negative feedback then regulates how much of these regulatory hormones are released and how much anterior pituitary hormone is secreted. Biology for AP Courses 2022-06-09T00:00:00Z The anterior pituitary receives products from the hypothalamus by the hypophyseal portal system and produces six hormones. Biology for AP Courses 2022-06-09T00:00:00Z The stimulation of the anterior pituitary by GnRH secretes the hormones LH and TSH. Biology for AP Courses 2022-06-09T00:00:00Z The hypothalamus produces separate hormones that stimulate or inhibit hormone production in the anterior pituitary. Anatomy and Physiology 2013-06-19T00:00:00Z A few examples of endocrine glands include the anterior pituitary, thymus, adrenal cortex, and gonads. Anatomy and Physiology 2013-06-19T00:00:00Z In contrast, the anterior pituitary does manufacture hormones. Anatomy and Physiology 2013-06-19T00:00:00Z Within the infundibulum is a bridge of capillaries that connects the hypothalamus to the anterior pituitary. Anatomy and Physiology 2013-06-19T00:00:00Z The stimulation of the anterior pituitary by GnRH triggers the secretion of the hormones LH and FSH. Biology for AP Courses 2022-06-09T00:00:00Z Hormones from the hypothalamus reach the anterior pituitary via the hypophyseal portal system. Anatomy and Physiology 2013-06-19T00:00:00Z This network, called the hypophyseal portal system, allows hypothalamic hormones to be transported to the anterior pituitary without first entering the systemic circulation. Anatomy and Physiology 2013-06-19T00:00:00Z GnRH activates the anterior pituitary to produce LH and FSH, which in turn stimulate Leydig cells and Sertoli cells, respectively. Anatomy and Physiology 2013-06-19T00:00:00Z For example, the structure of the anterior pituitary gland changes as vascularization decreases and the connective tissue content increases with increasing age. Anatomy and Physiology 2013-06-19T00:00:00Z Which hormone is released by the anterior pituitary as a part of the positive feedback loop between it and the ovary? Biology for AP Courses 2022-06-09T00:00:00Z |
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