endocrine system

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powerpoint presentation definition of gland one or more cells specialized in secretion. exocrine and endocrine unicellular gland and multicellular gland as well as liver cells. goblet cells have no ducts. the stomach has a sheet of mucus cells. apud cells exocrine, endocrine, mixed, merocrine apocrine holocrine, autocrine, paracrine, crinophagy exocrine, endocrine, mixed, merocrine apocrine holocrine, autocrine, paracrine, crinophagy formation for example the underlying mesenchyme cells induce the overlying epithelium to proliferate at the right site, invaginate, and differentiate to form the duct and secretory portion whose centrally located cells die by apoptosis leading to canalicuzation of the duct and secretory unit. the endocrine glands follow similar steps but the duct portion disintegrate and no canaliculizatio gland formation all the glands in the body are made of epithelia this includes both the secretory portions (secretory cells) and the cells that line the duct system. exocrine endocrine * formation forms of end …

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nsport 3 4 5 target cells’ response 6 feedback * general characteristics of endocrine glands: 1- structure: parenchymal and stroma. 2- highly vascularized. 3-ductless glands. 3- secretions (hormones) elaborated to interstitium then blood stream and to target organs with specific receptors for the hormone. 4- effective at very low concentrations. 5-direct or indirect feedback from the target site regulates further hormone elaboration. 5-hormones act at different speeds: peptides = seconds proteins = hours steroids = days origin ectodermal - pituitary, adrenal medulla (neural crest), pineal mesodermal - adrenal cortex, testis, ovaries endodermal - islets of langerhans, parenchymal cells of thyroid & parathyroid microscopic structure 1.unicellular endocrine units occur as single cells in another tissue. 2. neurosecretory: endocrine units contain cells which are structurally similar to neurons. 3. cords and clumps and follicles are arrangement of the secretory units. . 4. follicular endocrine units contain epithelial cells which form the walls …

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fluids growth sex-related differences in body shape and sexual functions behavior, temperament, and emotions. types of hormones peptide hormones proteins, glycoproteins, or short peptides bind to specific receptors on the target cell surface often stimulate production of intracellular second messengers, such as cyclic amp in the target cells types of hormones steroid hormones lipid soluble hormones can easily cross the target cell’s plasma membranes and thus directly affect cell function. bind to specific receptors found in the nucleus the hormone-receptor complex binds to acceptor proteins in the dna molecule leading to the ultimate production of the desired proteins. cellular morphology of endocrine cells varies depending on the chemical nature of the secretory product secreted by the cells. 1. protein and glycoprotein secreting cells contain extensive rer, have well-developed. golgi bodies, and frequently accumulate acidophilic secretory granules in their peripheral cytoplasm. 2. steroid secreting cells contain extensive ser, contain numerous mitochondria …

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--controlled by the hypothalamus. master switchboard  master gland general description components endocrine glands endocrine tissues （ pancreas islet ） endocrine cells function hormones are molecules that function in the body as chemical signals. what is hormone？ endocrine system produce hormones target organs act on target cells endocrine glands thyroid gland adrenal glands pituitary gland general description components endocrine glands endocrine tissues （ pancreas islet ） endocrine cells function what is hormone？ hormones are molecules that function in the body as chemical signals. endocrine system produce hormones target organs act on target cells hormones secretion special secreting forms autocrine paracrine common features ⑴ ductless ⑵ endocrine cells arrange into nests, cords, clusters or follicles ⑶ rich in capillaries two types of endocrine cells nitrogenous-hormone secreting cell steroid-hormone secreting cell thyroid gland general structure --- capsule : l.c.t forming septa --- parenchyma: lobules follicles interstitium: ct high mag of thyroid follicles …

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ules) → colloid. b. iodide → (iodide pump) → iodide oxidation in cytoplasm → colloid → bound to tyrosine residues of thyroglobulin → iodated thyroglobulin. c. iodated thyroglobulin → (tsh, microvilli) → endocytic vesicles →lys → t3 & t4. function of t3, t4: a. elevate the basal metabolic rate. b. influence the body growth and nervous system development during fetal life. modulation of t3, t4 secretion: hypothalamus-pituitary-thyroid axis pathological state hypothyroidism exophthalmic goiter in adults, thyroid hormone overproduction underproduction myxoedema hyperthyroidism a consequence of an increase in body’s metabolism: clinical features: ★ feeling hot ★ increased sweating ★ weight loss, with proximal muscle weakness ★ rapid heart rate ★ anxiety and restless hyperactivity ★ diarrhoea thyroid hormone deficiency slows body processes: clinical features: ★ dry, puffy skin ★ inability to keep warm ★ weight gain ★ a slow heart rate ★ loss of energy and appetite ★ constipation pathological state …

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powerpoint presentation definition of gland one or more cells specialized in secretion. exocrine and endocrine unicellular gland and multicellular gland as well as liver cells. goblet cells have no ducts. the stomach has a sheet of mucus cells. apud cells exocrine, endocrine, mixed, merocrine apocrine holocrine, autocrine, paracrine, crinophagy exocrine, endocrine, mixed, merocrine apocrine holocrine, autocrine, paracrine, crinophagy formation for example the underlying mesenchyme cells induce the overlying epithelium to proliferate at the right site, invaginate, and differentiate to form the duct and secretory portion whose centrally located cells die by apoptosis leading to canalicuzation of the duct and secretory unit. the endocrine glands follow similar steps but the duct portion disin...

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