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  • What are endocrine glands? Ductless glands that secrete hormones into intracellular spacesWhat is a target organ cell? A cell that has receptors for a specific hormone
  • What are the two major classes of hormones? Nonsteroid and steroid hormonesWhat is a second messenger mechanism? Chemical that provides communication within a hormone’s target cellWhat are steroid hormones? Hormones that can pass through the target cell’s membrane to the nucleus where they bind with a receptor to form a hormone-receptor complexGive an example of a steroid hormone. Estrogen
  • Give an example of positive feedback. During labor, muscle contractions become stronger by means of a positive feedback mechanism that regulates the secretion of oxytocin.Give an example of negative feedback. Insulin
  • What is the name of a physician who specializes in endocrine disorders? EndocrinologistWhat are some diseases caused by hypersecretion of a hormone? Hypoglycemia, Graves disease, gigantism, water retention, Cushing syndromeWhat are some diseases caused by hyposecretion of a hormone? Goiter, cretinism, dwarfism, diabetes insipidus, Addison disease, myxedema
  • Do prostaglandins meet the definition of a typical hormone? NoHow do prostaglandins differ from most hormones? Prostaglandins only influence the activities of neighboring cells.What research is being conducted with prostaglandins? The role of prostaglandins in the treatment of high blood pressure, asthma, and ulcers
  • Why is the anterior pituitary gland sometimes called the master gland? It controls the thyroid gland, the adrenal cortex, the ovarian follicles, and the corpus luteum.What do the major hormones do? ACTH stimulates the adrenal cortex, causing it to increase in size and secrete larger amounts of its hormones.See Table 11-1.
  • How do growth hormones promote normal growth? They speed up the movement of amino acids out of the blood and into the cells, which accelerates the cells’ anabolism of amino acids to form tissue proteins.
  • What does the hyposecretion of ADH cause? Diabetes insipidusHow are dehydration and electrolyte imbalances treated? With injections or nasal sprays containing ADH
  • In addition to oxytocin and ADH, what substances does the hypothalamus produce? Releasing and inhibiting hormones that travel to the anterior pituitary glandThe hypothalamus regulates many body functions related to homeostasis. Give some examples. Body temperature, appetite, and thirst
  • How do T3 and T4 influence body cells? They speed up their release of energy from foods.How does calcitonin help maintain homeostasis of blood calcium? It decreases blood calcium concentrations.Where is the thyroid located? In the neck just below the larynxPlace thumb and forefinger on each side of the trachea and swallow. The part you feel that goes up and down is the thyroid.
  • How does PTH increase calcium? It stimulates bone-resorbing cells to increase their breakdown of bone’s hard matrix, which frees the calcium stored there.
  • Where is the adrenal gland? It curves over the top of each kidney.What are hormones secreted by the adrenal cortex called? CorticoidsWhat are the adrenal cortex and the adrenal medulla? The adrenal cortex is the outer part of an adrenal gland; the medullais its inner part.What is the chief mineralocorticoid? AldosteroneWhat does aldosterone do? Increases the amount of sodium and decreases potassium in the blood.
  • Secretion of glucocorticoid quickly increases when the body is under stress.
  • During periods of prolonged stress, glucocorticoids may have harmful side effects because they are anti-inflammatory and cause blood vessels to constrict.
  • How do endocrine glands differ from pancreatic islets? Endocrine glands are much larger than pancreatic islets.
  • What happens if the pancreatic islets don’t secrete enough insulin? Blood glucose increases: hyperglycemia.
  • How are most screening tests for diabetes mellitus done? With a drop of bloodTesting for sugar in the urine is another common screening procedure.
  • The cells of the testes produce what? SpermThe interstitial cells in the testes secrete what male sex hormone directly into the blood? Testosterone
  • Where is the thymus located? In the mediastinum
  • These hormones maintain the corpus luteum during pregnancy.What fact led to the development of the early pregnancy test? During the earliest weeks of pregnancy the kidneys excrete chorionic gonadotropins into the urine.
  • Why is this gland named “pineal”? Because it resembles a pine nut.
  • Nearly every organ and system has an endocrine function.

F endocrine system F endocrine system Presentation Transcript

  • The Endocrine SystemMosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Objectives• Distinguish between endocrine and exocrine glands and define the terms hormone and prostaglandin• Identify and locate the primary endocrine glands and list the major hormones produced by each gland• Describe the mechanisms of steroid and non-steroid hormone action Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Objectives• Explain how negative and positive feedback mechanisms regulate secretion of endocrine hormones• Explain the primary mechanisms of endocrine disorders• Identify the principal functions of each major endocrine hormone and describe the conditions that may result from hyposecretion or hypersecretion• Define diabetes insipidus, diabetes mellitus, gigantism, goiter, cretinism, and glycosuria Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mechanisms of Hormone Action• Endocrine glands secrete chemicals (hormones) into the blood• Hormones perform general functions of communication and control, but a slower, longer-lasting type of control than that provided by nerve impulses• Cells acted on by hormones are called target organ cells Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mechanisms of Hormone Action• Nonsteroid hormones (first messengers) bind to receptors on the target cell membrane, triggering second messengers to affect the cell’s activities• Steroid hormones bind to receptors within the target cell nucleus and influence cell activity by acting on DNA Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Regulation of Hormone Secretion• Hormone secretion is controlled by homeostatic feedback• Negative feedback—mechanisms that reverse the direction of a change in a physiological system• Positive feedback—(uncommon) mechanisms that amplify physiological changes Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mechanisms of Endocrine Disease• Hypersecretion—secretion of excess hormone• Hyposecretion—insufficient hormone secretion• Polyendocrine disorders—hyper- or hyposecretion of more than one hormone• Target cell insensitivity produces results similar to hyposecretion• Endocrinologists have developed many different strategies for treatment (e.g., surgery and hormone therapy) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Prostaglandins• Prostaglandins (PGs) are powerful substances found in a wide variety of body tissues• PGs are often produced in a tissue and diffuse only a short distance to act on cells in that tissue• Several classes of PGs include prostaglandin A (PGA), prostaglandin E (PGE), and prostaglandin F (PGF)• PGs influence many body functions, including respiration, blood pressure, gastrointestinal secretions, and reproduction Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland• Anterior pituitary gland (adenohypophysis) – Names of major hormones • Thyroid-stimulating hormone (TSH) • Adrenocorticotropic hormone (ACTH) • Follicle-stimulating hormone (FSH) • Luteinizing hormone (LH) • Growth hormone (GH) • Prolactin (lactogenic hormone) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland– Functions of major hormones • TSH—stimulates growth of the thyroid gland; also stimulates it to secrete thyroid hormone • ACTH—stimulates growth of the adrenal cortex and stimulates it to secrete glucocorticoids (mainly cortisol) • FSH—initiates growth of ovarian follicles each month in the ovary and stimulates one or more follicles to develop to the stage of maturity and ovulation; FSH also stimulates estrogen secretion by developing follicles; stimulates sperm production in the male Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland– Functions of major hormones • LH—acts with FSH to stimulate estrogen secretion and follicle growth to maturity; causes ovulation; causes luteinization of the ruptured follicle and stimulates progesterone secretion by corpus luteum; causes interstitial cells in the testes to secrete testosterone in the male Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland• GH—stimulates growth by accelerating protein anabolism; also accelerates fat catabolism and slows glucose catabolism; by slowing glucose catabolism, tends to increase blood glucose to higher than normal level (hyperglycemia) – Hypersecretion during childhood results in gigantism and during adulthood results in acromegaly – Hyposecretion during childhood results in pituitary dwarfism• Prolactin or lactogenic hormone—stimulates breast development during pregnancy and secretion of milk after the delivery of the babyMosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland• Posterior pituitary gland (neurohypophysis) – Names of hormones • Antidiuretic hormone (ADH) – Hyposecretion causes diabetes insipidus, characterized by excessive volume of urine • Oxytocin (OT) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pituitary Gland– Functions of hormones • ADH—accelerates water reabsorption from urine in the kidney tubules into the blood, thereby decreasing urine secretion • Oxytocin—stimulates the pregnant uterus to contract; may initiate labor; causes glandular cells of the breast to release milk into ducts Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Hypothalamus• Actual production of ADH and oxytocin occurs in the hypothalamus• After production in the hypothalamus, hormones pass along axons into the pituitary gland• The secretion and release of posterior pituitary hormones is controlled by nervous stimulation• The hypothalamus controls many body functions related to homeostasis (temperature, appetite, and thirst) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Thyroid Gland• Names of hormones – Thyroid hormone—thyroxine (T4) and triiodothyronine (T3) – Calcitonin (CT)• Functions of hormones – Thyroid hormones—accelerate catabolism (increase the body’s metabolic rate) – Calcitonin—decreases the blood calcium concentration by inhibiting breakdown of bone, which would release calcium into the blood Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Thyroid Gland• Hyperthyroidism (hypersecretion of thyroid hormones) increases metabolic rate – Characterized by restlessness and exophthalmos (protruding eyes) – Graves disease is an inherited form of hyperthyroidism Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Thyroid Gland• Hypothyroidism (hyposecretion of thyroid hormones) – May result from different conditions – Simple goiter—painless enlargement of thyroid caused by dietary deficiency of iodine – Hyposecretion during early development may result in cretinism (retardation) and during adulthood in myxedema (characterized by edema and sluggishness) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Parathyroid Glands• Name of hormone—parathyroid hormone (PTH)• Function of hormone—increases blood calcium concentration by increasing the breakdown of bone with the release of calcium into the blood Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands• Adrenal cortex – Names of hormones (corticoids) • Glucocorticoids (GCs)—chiefly cortisol (hydrocortisone) • Mineralocorticoids (MCs)—chiefly aldosterone • Sex hormones—small amounts of male hormones (androgens) secreted by adrenal cortex of both sexes Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands– Three cell layers (zones) • Outer layer—secretes mineralocorticoids • Middle layer—secretes glucocorticoids • Inner layer—secretes sex hormones– Mineralocorticoids—increase blood sodium and decrease body potassium concentrations by accelerating kidney tubule reabsorption of sodium and excretion of potassium Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands– Functions of glucocorticoids • Help maintain normal blood glucose concentration by increasing gluconeogenesis—the formation of ―new‖ glucose from amino acids produced by the breakdown of proteins, mainly those in muscle tissue cells; also the conversion to glucose of fatty acids produced by the breakdown of fats stored in adipose tissue cells • Play an essential part in maintaining normal blood pressure—make it possible for epinephrine and norepinephrine to maintain a normal degree of vasoconstriction, a condition necessary for maintaining normal blood pressure Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands• Act with epinephrine and norepinephrine to produce an antiinflammatory effect, to bring about normal recovery from inflammations of various kinds• Produce anti-immunity, antiallergy effect; bring about a decrease in the number of lymphocytes and plasma cells and therefore a decrease in the amount of antibodies formed• Secretion of glucocorticoid quickly increases when the body is thrown into a condition of stress; high blood concentration of glucocorticoids, in turn, brings about many other stress responsesMosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands• Adrenal medulla – Names of hormones—epinephrine (Epi), or adrenaline, and norepinephrine (NR) – Functions of hormones—help the body resist stress by intensifying and prolonging the effects of sympathetic stimulation; increased epinephrine secretion is the first endocrine response to stress Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands• Adrenal abnormalities – Hypersecretion of glucocorticoids causes Cushing syndrome: moon face, hump on back, elevated blood sugar levels, frequent infections – Hypersecretion of adrenal androgens may result from a virilizing tumor and cause masculinization of affected women Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Adrenal Glands– Hyposecretion of cortical hormones may result in Addison disease: muscle weakness, reduced blood sugar, nausea, loss of appetite, and weight loss Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pancreatic Islets• Names of hormones – Glucagon—secreted by alpha cells – Insulin—secreted by beta cells• Functions of hormones – Glucagon increases the blood glucose level by accelerating liver glycogenolysis (conversion of glycogen to glucose) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pancreatic Islets• Functions of hormones – Insulin decreases the blood glucose by accelerating the movement of glucose out of the blood into cells, which increases glucose metabolism by cells Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pancreatic Islets• Diabetes mellitus – Type 1 results from hyposecretion of insulin – Type 2 results from target cell insensitivity to insulin – Glucose cannot enter cells and thus blood glucose levels rise, producing glycosuria (glucose in the urine) Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Female Sex Glands• The ovaries contain two structures that secrete hormones—the ovarian follicles and the corpus luteum; see Chapter 22• Effects of estrogen (feminizing hormone) – Development and maturation of breasts and external genitals – Development of adult female body contours – Initiation of menstrual cycle Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Male Sex Glands• The interstitial cells of testes secrete the male hormone testosterone; see Chapter 22• Effects of testosterone (masculinizing hormone) – Maturation of external genitals – Beard growth Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Male Sex Glands• Effects of testosterone – Voice changes at puberty – Development of musculature and body contours typical of the male Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Thymus• Name of hormone—thymosin• Function of hormone—plays an important role in the development and function of the body’s immune system Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Placenta• Name of hormones—chorionic gonadotropins, estrogens, and progesterone• Functions of hormones—maintain the corpus luteum during pregnancy Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pineal Gland• A small gland near the roof of the third ventricle of the brain – Glandular tissue predominates in children and young adults – Becomes fibrous and calcified with age• Called third eye because its influence on secretory activity is related to the amount of light entering the eyes Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Pineal Gland• Secretes melatonin, which: – Inhibits ovarian activity – Regulates the body’s internal clock• Abnormal secretion of (or sensitivity to) melatonin may produce seasonal affective disorder (SAD) or winter depression, a form of depression that occurs when exposure to sunlight is low and melatonin levels are high Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.
  • Other Endocrine Structures• Many organs (e.g., the stomach, intestines, and kidney) produce endocrine hormones• The atrial wall of the heart secretes atrial natriuretic hormone (ANH), which stimulates sodium loss from the kidneys• Fat-storing cells secrete leptin, which controls how full or hungry we feel Mosby items and derived items © 2010, 2006, 2002, 1997, 1992 by Mosby, Inc., an affiliate of Elsevier Inc.