Sk Task 1 Pituitary Gland

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SK TASK 1: Label the diagram and give brief description of each of these organs. The Pituitary Gland: The Pituitary gland or hypophysis is a small gland about 1 centimetre in diameter or the size of a pea. It is surrounded by bone as it rests in the sella turcica, a depression in the sphenoid bone. The gland is connected to the hypothalamus of the brain by a slender stalk called the infundibulum. The main function of the pituitary gland is to regulate the human growth hormone (HGH) and weight; main controller along with the genes of final height of a person. A malfunction in the pituitary gland can cause hypersecretion which results in gigantism or acromegaly and hypo secretion can result in dwarfism. The Thyroid Gland: The Thyroid gland is a very small vascular organ that is located in the neck. It consists of two lobes, one on each side of the trachea, just below the larynx or the voice box. The two lobes are…show more content…
adrenal medulla/adrenaline * Paracrine - that secretes hormones that affect adjacent cells e.g. gastric mucosa/gastrin/gastric pits. * Autocrine – regulate their own avtivity by the secretion of hoirmone e.g. interstitial cells of testis/testosterone Each target cell in the body is regulated only by those hormones to which it has receptor molecules , and not y others.different cells may respond in different ways to the same hormone – the transduction machinery of different target cells ‘reads’ the hormone signal in different ways. Blood hormone concentrationare usually governed by negative feedback control – a reduction in concentration stimulates additional secretion and an increase in concentration inhibits further secretion. Once hormone binds to a receptor moleculethey are usually degraded rapidly. This ‘rapid recovery system’ mens that the target calls can be sensitive to changing levels of the hormones that regulate their

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