The Endocrine System - Zen Shiatsu 1 The Endocrine System Exocrine Glands vs. Endocrine Glands Two different modes of secretion Exocrine Glands Endocrine Glands “exo ...
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10/17/20111The Endocrine SystemExocrine Glands vs. Endocrine GlandsTwo different modes of secretionExocrine Glands Endocrine Glandsexo- = external, -crine = secretion endo- = internal, -crine = secretionGland using a duct to carry secretion to the body surface.Gland directly secreting hormones into the bloodstream without using a duct.Ex: sweat glands Ex: adrenal glandSweatGlandNegative Feedback MechanismIf your home is cold, the thermostat senses this drop and turns on the heat.If the heat were to stay on indefinitely, the house would become too hot. So, at a certain determined point (equilibrium/homeostasis), the thermostat senses that the right temperature has been reached and the heat is turned off.This process is called negative because the feedback turns the system off. 10/17/20112Negative Feedback MechanismFeedback MechanismsYin-Yang Five ElementsNegative Feedback loop = Yin aspect(oppose/decrease outside stimulus)Positive Feedback loop= Yang aspect (encourage/increase outside stimulus)Sheng Cycle (Generating Cycle) = Positive Feeback loopKe Cycle (Control Cycle) = Negative Feedback loopIntroduction Both the nervous and endocrine systems are involved in homeostasis (balance) by regulating the bodys activities (i.e., growth, sleep, emotions, metabolism, sexual function, and development). Compared to the nervous system, the endocrine system is more closely associated with growth and development, and its responses tend to be long-lasting, whereas nervous system responses tend to be rapid and discrete. Whats the benefit of the endocrine systems long-lasting responses? How can it be a detriment?10/17/20113Introduction to Endocrine SystemHormones The endocrine system releases powerful, stimulating hormones (chemical messengers/catalysts) directly into the bloodstream which target specific cells. These chemical messengers are like switches which start or stop various physiological processes in the body. Hormones increase or decrease the rates of normal cellular activity.Endocrine Glands Explored Endocrine glands include: Pituitary Gland Thyroid Gland Parathyroid Gland Adrenal Gland Pineal Gland Thymus ** Several organs containing endocrine tissue that also perform other functions: Pancreas Gonads (Ovaries & Testes) Placenta**Technically, considered a lymphoid organ not an endocrine gland.10/17/20114Hypothalamic-Pituitary-Target Gland Axis Concepts: Hypothalamus: Main visceral control center of the body and is vitally important to overall body homeostasis Influences blood pressure, rate and force of heartbeat, digestive tract motility, eye pupil size; initiates most physical expressions of emotion; regulates body temperature; regulates food intake/satiety-hunger; regulates water balance and thirst; regulates sleep-wake cycle; controls endocrine system functioning.Hypothalamic-Pituitary-Target Gland Axis Concepts: Pituitary Gland: Securely seated in the sella turcicaof the sphenoid bone, this pea-sized gland secretes at least nine hormones. Gland has two lobes Posterior Pituitary (lobe) is primarily nerve fibers and acts as a hormone-storage area. Anterior Pituitary (lobe) is glandular tissue which manufactures and releases hormones. 10/17/20115Hypothalamic-Pituitary-Target Organ AxisAbbreviation Hormone Target Organs & EffectsGH Growth hormone Liver, muscle, bone, cartilage, and other tissues: anabolic hormone; stimulates somatic growth; mobilizes fats; spares glucoseTSH Thyroid-stimulating hormoneThyroid gland: stimulates thyroid gland to release thyroid hormonePRL Prolactin Breast secretory tissue: promotes lactationACTH AdrenocorticotropichormoneAdrenal cortex: promotes release of glucocorticoids and androgens; help both to resist stressorsFSH Follicle-stimulating hormoneOvaries & testes: in females, stimulates ovarian follicle maturation and estrogen production; in males, stimulates sperm production.Hypothalamic-Pituitary-Target Organ AxisAbbreviation Hormone Target Organs & EffectsLH Luteinizing hormone Ovaries & testes: in females, triggers ovulation and stimulates ovarian production of estrogen & progesterone; in males, promotes testosterone productionADH Antidiuretic hormone or vasopressinKidneys: stimulates kidney tubule cells to reabsorb waterOxytocin Oxytocin Uterus: stimulates uterine contractions; initiates labor; breast: initiates milk ejection.Thyroid Gland Location: Anterior neck, on trachea just inferior to larynx. Function: Secretes thyroid hormone (T4 & T3) which regulates various aspects of metabolism.10/17/20116Thyroid GlandCommon Pathologies Hypothyroidism Underactive thyroid gland due to thyroid defect, post-surgical damage/removal, radiotherapy, iodine deficiency or congenital/autoimmune conditions. Low metabolic rate; feeling chilled; constipation; thick, dry skin and puffy eyes; edema; lethargy; mental sluggishness; and goiter (enlarged thyroid gland).GoiterThyroid GlandCommon Pathologies Graves Disease Most common hyperthyroid pathology. Autoimmune disease Person has abnormal antibodies which mimic TSH and continuously stimulate TH release. Elevated metbolic rate; sweating; rapid, irregular heartbeat; nervousness; weight loss despite adequate food intake; exophthalmos (protrusion of eyeballs).ExophthalmosParathyroid Gland Location: Four to eight, tiny, yellow-brown glands in the posterior aspect of thyroid gland. Function: Parathyroid hormone: controls the calcium balance in the blood. Important for transmission of nerve impulses, muscle contraction and blood clotting.10/17/20117Parathyroid GlandCommon Pathologies Hyperparathyroidism Rare, usually results from parathyroid gland tumor. Calcium is leached from bones; bones soften and deform as their mineral salts are replaced with fibrous connective tissue.Parathyroid GlandCommon Pathologies Hypoparathyroidism Most often due to parathyroid gland trauma or removal during thyroid surgery. Can be due to excessive deficiency of dietary magnesium. Loss of sensation, muscle twitches, convulsions, congenital abnormalities.Adrenal Glands Location: Pyramid-shaped organs perched atop the kidneys; enclosed in a fibrous capsule and a cushion of fat. Function: Each adrenal is structurally and functionally two endocrine glands. Adrenal Medulla part of the sympathetic nervous system; synthesizes catecholamines Adrenal Cortex glandular tissue synthesizes corticosteroids.10/17/20118Adrenal Glands Hormones Adrenal Cortex Corticosteroids Over two-dozen steroid hormones Steroid hormones are not stored in cells; rate of release in response to stimulation depends on rate of synthesis Primary hormones produced: aldosterone, cortisol, testosterone and estrogen Hormones Adrenal Medulla Catecholamines Epinephrine Norepinephrine Activated in a fight-or-flight response by some short-term stressors. Unlike adrenocorticalhormones, which promote long lasting responses to stressors, catecholamines cause fairly brief responses.Parasympathetic-Sympathetic RegulationAdrenal GlandsCommon Pathologies Aldosteronism Typically results from adrenal tumors Resulting in hypertension, edema and potassium loss If K+ is extreme, muscle weakness and eventually paralysis occurs.This is Very Rare.10/17/20119Adrenal GlandsCommon Pathologies Addisons Disease Deficits in both glucocorticoids and mineralocorticoids Weight lose; severe dehydration; hypotensionAdrenal GlandsCommon Pathologies Cushings Syndrome Persistent elevated blood glucose levels; dramatic loss in muscle and bone protein; water and salt retentionleading to hypertension and edema. Because of enhanced anti-inflammatory effects, infections may become overwhelmingly severeAdrenal GlandsCommon Pathologies Adrenogenital Syndrome Masculinization Females develop a beard and masculine pattern of body hair distribution, and the clitoris grows to resemble a small penis. In young men, early maturation of sex organs, secondary sex characteristics, and high sex drive.10/17/201110Pancreas Location: A soft, triangular organ partially behind the stomach in the abdomen Composed of both endocrine and exocrine gland cells Produces insulin and glucagon to regulate blood glucose levels.PancreasCommon Pathologies Diabetes Mellitus (DM) Insulin is absent or deficient; blood glucose levels remain high after meals because glucose is unable to enter most tissue cells. When hyperglycemia is excessive, person is nauseated; goes in a sympathetic response with increases blood glucose levels When glucose cannot to used for fuel, more fats are used resulting in high levels of fatty acids in the blood (ketones). If untreated, ketoacidosis(accumulation of ketones in the blood) disrupt heart activity, oxygen transport and severe depression of nervous system leads to coma and death. Three cardinal signs of DM Polyurialarge urine output; leading to decreased blood volumn & dehydration. Polydipsiaexcessive thirst; stimulated by dehydration Polyphagiaexcessive hunger and food consumption; unable to use the glucose, the body begins to utilize its fat & protein stores for energy.Pineal Gland Location: Tiny, pine cone-shaped organ hanging from roof of the third ventricle Function: Not fully understood Major secretory product is melatonin, a powerful antioxidant and hormone derived from serotonin. Help to make us drowsy Affects timing of puberty Circadian rhythm10/17/201111Gonads Male and female primary reproductive organs Location & Function: Females: ovaries Small, oval organs located in the females abdominopelvic cavity Produce estrogens & progesterone Males: testes Located in the scrotum, an extra-abdominal skin pouch Produce sperm and testosteroneThymus Location: Deep to sternum in thorax. Diminishes in size throughout adulthood. By old age, it is composed largely of adipose and fibrous connective tissue. Function: Not well understood; involved in normal development of T Lymphocytes and immune response.
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