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59 Cards in this Set
- Front
- Back
what are hormones?
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endogenous chemicals that are produced locally and act in different parts of the body
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how do hormones maintain homeostasis?
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they stimulate or inhibit biological responses
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how is hormone concentration controlled?
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negative feedback
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an endocrine disorder is an _________ in physiological functions
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imbalance (deficiency or excess hormones)
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what are the 4 endocrine tets and what disease is each used to test for?
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plasma hormone concen (thyroid)
integrity of feedback mechanism (thyroid) plasma substance concen (DM) measurement of physiological effect (DI) |
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what does the integrity of feedback mechanism test tell you about the thyroid & anterior pituitary
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the thyroid is functioning properly but the anterior pituitary is not
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what are the 3 general locations within the body?
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intravascular
intracellular extracellular |
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insulin is produced as a result of?
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hyperglycemia (insulin is the only substance that brings down blood sugar)
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what are the 7 roles of insulin in the body?
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1. stim glucose uptake
2. promote glucose storage (glycogenesis) 3. inhibits glycogenolysis 4. enhances fat storage (lipogenesis) 5. inhibits lipolysis 6. decr ketogenesis 7. inhibits gluconeogenesis |
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glycogenesis
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storage of glucose as glycogen in muscle & liver
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gylcogenolysis
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breakdown of glycogen (inhibits production of glucose from liver & muscle)
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lipogenesis
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fat storage
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lipolysis
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break down / mobilization of fat for energy
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ketogenesis
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breakdown of fatty acids to ketone bodies
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gluconeogenesis
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formation of glucose from non carb sources (amino acids)
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what are the 4 counteregulatory hormones that control glucose levels
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glucagon
epinephrine cortisol growth hormone |
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where is glucagon produced?
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alpha cells of the pancreas
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what effect does glucagon have on glucose homeostasis?
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glycogenolysis
glucose synthesis |
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what efect does epi have on glucose homeostasis
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glycogenolysis
glucose synthesis |
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what effect does cortisol have on glucose homeostasis
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gluconeogenesis
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what effect does growth hormone have on glucose homeostasis?
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inhibits uptake of glucose
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what are the physiological effects of insuline defiency?
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impaired glucose uptake (muscle)
impaired glycogenesis (liver) impaired insulin induced supression of gluconeogenesis & glycogenolysis |
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what are the 9 effects of a total lack of insulin in the body (type I DM)
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1. incr blood glucose concen
2. incr osmolarity (polyuria & polydipsia) 3. dehydration & electrolyte abnormalities 4. incr lipolysis 5. glycerol incr blood glucose even further 6. ketogenesis 7. ketonemia, acidosis, ketonuria 8. kussmaul breathing 9. ketoacidosis can lead to coma & death |
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what is kussmal breathing
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rapid, deep, labored breathing
trying to compensate for acidosis |
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8 s/s of type I diabetes
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hyperglycemia
polyuria polydyspia polyphagia dehydration acidosis kassmaul breathing hypokalemia |
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what is type II diabetes?
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a relative lack of insulin & insulin resistance
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what are the 4 s/s of type II diabetes?
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hyperglycemia
polyuria polydypsia dehydration |
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what may be a cause of hypogylcemia?
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over-treatment with antidiabetic drugs
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what are the 7 s/s of hypoglycemia
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hunger
sweat nervous sleepy anxious clumsy bg < 70mg/dL |
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what are the microvascular long term complications of DM?
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retinopathy
neuropathy nephropathy (renal) |
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what are the macrovascular long term complications of DM?
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cerebral vascular
coronary artery peripheral vascular disease |
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what are the 4 tests to assess glucose control?
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fasting plasma glucose
oral glucose tolerance test gycosylated hemoglobin fructosamine |
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which test is the best indicator of glucose homeostasis?
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fasting plasma glucose
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what does the fasting plasma glucose test measure?
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the ability of endogenous or exogenous insulin to prevent fasting hyperglycemia (trough levels more reproducible)
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is FPG used to screen or diagnose?
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screen
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how is the FPG test conducted
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must fast for 8 hours
venipuncture use seperator tube, add sodium floride, or refrigerate |
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FPG normal range, prediabetes range, & diagnosis range
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normal < 110mg/dL
pre > 100 to <126mg/dL diagnose >126mg/dL (on 2 occasions) |
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in an FPG test, the first reading is considered a _________ while the second is a __________
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screening
diagnosis |
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what are some causes of abnormal lab results in the FPG test
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improper collection
improper storage |
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the american diabetic association recommends sreenings for:
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those >45 yo (every 3 yrs)
>25kg/m2 + dyslipedemia, vascular disease, polysystic ovarian disease |
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what are the 5 possible results of a diagnostic test
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confirm suspected diagnosis
differentiate among possible diagnoses determine severity of disease detect recurrence of disease monitor therapy |
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when is the OGT test used?
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when a patient has s/s
when FPG suggests prediabetes |
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what does the OGT test tell you?
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the body's ability to secret insulin
body's response to insulin action |
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OGT test normal range, prediabetes range, provisional dx range, & confirm dx range
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nl <140mg/dL
pre >140-200mg/dL pro >200mg/dL confirm + raised FPG |
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how is OGT test conducted
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overnight fast
75g oral glucose dose taken over 5 min samples taken between 0-2hr sodium floride tube or assay immedietly |
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what can cause an abnormal OGT test result?
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improper collection
improper storage malnourished consume inadequate carbs bedridden alcohol medication that causes hypergylcemia coffee smoking |
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does the gycosylated hemoglobin test monitor short or long term control of glucose?
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long term (2-3months)
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which subfraction of Hb is used in the gycosylated hemoglobin test?
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A1C
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calculation for mean daily plasma glucose
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10*(A1C + 4)
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what is the reference range for the gycosylated hemoglobin test?
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>7% suggets poor glucose control
up to 20% for persistent hyperglycemia |
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what is the specimen for the GH test?
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RBC (Hb) not plasma or serum
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what can cause abnormal gycosylated hemoglobin test results?
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false elevation (uremia, chronic alcohol intake, hypertriglyceridemia, pregnancy)
falsely lowered (pregnancy, hemolysis) |
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what can't the GH test be used to screen for gestational diabetes?
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pregnancy can cause false elevations & depressions
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what is the reference range for the GH test?
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varies with assay method
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how often shouild a patient with good glycemic control get a GH test? a person with poor control?
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1-2 times a year
4 times a year |
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when is the fructosamine test used?
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for acute cases - to see how a patient is doing
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reference range for the fructosamine test?
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<285 umol/L (can vary)
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where does the specimen come from for the fructosamine test?
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serum or plasma b/c using glycosylated proteins
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what can cause an abnormal lab result in the fructosamine test?
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falsely elevated (serum Hb concen >100mg/dL, serum bilirubin >4mg/dL, serum ascorbic acid >5mg/dL, methyl dopa & Ca dobesilate)
falsely lower (obesity) |