homeostasis and diabetes l2
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Homeostasis and Diabetes L2. What is Homeostasis?. Body cells work best if they have the correct Temperature Water levels Glucose concentration Your body has mechanisms to keep the cells in a constant environment. What is Homeostasis?. - PowerPoint PPT PresentationTRANSCRIPT
Homeostasis and Diabetes L2
What is Homeostasis? Body cells work best if they have the
correct Temperature Water levelsGlucose concentration
Your body has mechanisms to keep the cells in a constant environment.
What is Homeostasis?
The maintenance of a constant
environment in the body is called
Homeostasis
Controlling Glucose levels
Your cells (muscles, brain, etc) need an exact level of glucose in the blood. (normal serum level 65 – 105 mg)
Excess glucose gets turned into glycogen in the liver
Blood glucose levels are regulated by 2 hormones (chemical messengers) from the pancreas called:
InsulinGlucagon
Normal Maintenance of Blood Glucose Levels
Eat a meal: Pancreas detects increased glucose
levels in blood and secretes INSULIN This results in uptake of GLUCOSE by:
Cells that need it for energy (including brain)
Liver and muscle cells to be stored as glycogen
Pancreas stops release of Insulin Glucose levels return to normal (80-
120)
Time
Glucose Concentration
Meal eaten
Insulin is produced and glucose levels fall to normal again.
Glucose levels rise after a meal.
Normal
If there is too much glucose in the blood, Insulin tells the liver to convert some of it to glycogen
Glycogen
Insulin
Glucose in the blood
Hyperglycemia When blood glucose becomes
high INSULIN allows glucose to enter
cellsLiver
Produce & store glycogen Inhibits glycogen breakdown
Muscles Promotes protein and glycogen synthesis
Fat cells Promotes storage of triglycerides
Hyperglycemia= high blood glucose levels
Drowsy Flushed Thirsty
Normal Maintenance of Blood Glucose Levels, cont.
Blood glucose drops due to NOT eating
Pancreas detects and releases glucagon stimulates the release of glycogen
(broken down to glucose) Glucose is released into the blood
and levels return to normal.
Time
Glucose Concentration
Meal eaten
Insulin is not produced so glucose levels stay high
Glucose levels rise after a meal. Diabetic
If there is not enough glucose in the blood, Glucagon tells the liver to convert glycogen into glucose.
Glycogen
Glucagon
Glucose in the blood
Hypoglycemia= LOW blood sugar
Glucagon: causes release of glucose from liverbreakdown of glycogen to glucose
Hypoglycemia
Weak, sweaty Confused/
irritable/ disoriented
Diabetes Some people do not produce enough
insulin. When they eat food, the glucose
levels in their blood cannot be reduced.
This condition is known as DIABETES.
Diabetics sometimes have to inject insulin into their blood. They have to be careful of their diet.
The glucose in the blood increases,
Glycogen
Insulin
Glucose in the blood
but there is no insulin to tell the liver to convert it into glycogen.Glucose concentration rises to dangerous levels.
Diabetes Mellitus(problem with glucose
metabolism) Major health problem US/worldwide Complications [lousy blood vessels]
Blindness Renal failure Amputations [heart attacks and strokes] [OB/neonatal complications]
Diabetes Mellitus
The good news:Blood glucose control reduces complications of Diabetes!
Diabetes MellitusAbsence (or ineffectiveness
of ) insulinCellular resistanceCells can’t use glucose for
energyStarvation mode
Compensatory breakdown of body fat/protein
Diabetes Mellitus HYPERGLYCEMIA: fluid/electrolyte
imbalance. Sodium, chloride, potassium excreted
(frequent urination) Dehydration (thirsty all the time) cells are starving, so person feels
hungry despite eating huge amounts of food. Starvation state remains until insulin is available. (eats too much)
Diabetes Mellitus Complications of chronic
hyperglycemia Macrovascular complications
Cardiovascular disease (heart attack)Cerebrovascular disease (strokes)
Microvascular Blindness (retinal proliferation, macular
degeneration) Amputations Diabetic neuropathy (diffuse, generalized,
or focal) Erectile dysfunction
Classifying Diabetes Mellitus
Type I Diabetes: autoimmune Beta cell destruction in genetically
susceptible person
Some viral infections
Classifying Diabetes Mellitus
Type II Diabetes Reduction in ability of most cells to
respond to insulin Poor control of liver glucose output Decreased beta-cell function (eventual
failure)
Diabetes Mellitus Major risk factors
Family history Obesity Origin (Afro-American, Hispanic, Native
American, Asian-American) Age (older than 45) History of gestational diabetes High cholesterol Hypertension
Diabetes Mellitus Prevention of effects:
combination approach Increased exercise
Decreases need for insulin Reduce calorie intake
Improves insulin sensitivity Weight reduction
Improves insulin action
Triad of Treatment
Diet Medication
Oral hypoglycemics
Insulins Exercise
Diabetes treatment
Exercise Under physician supervision Check glucose prior
Diabetes treatment
Diet Lower calorie Fewer foods of “high glycemic
index” Spread meals evenly
Diabetes treatment Anti-Diabetic medications
Oral hypoglycemic agents
Insulins
Stimulate pancreas to secrete insulin Glyburide
Adverse reactions Hypoglycemia Water retention/edema Photosensitivity
May need to add insulin in times of stress
Insulin
Made in beta cells of the pancreas Moves glucose into cells (thus acts
like growth hormone in a way) Moves potassium into cells (can buy
time in emergencies)
Insulin preparations
Rapid acting Short acting
(regular) Intermediate
acting (NPH) Long acting
Some things to know
Insulin moves potassium into cells Good for emergency situations Dangerous if potassium level already
low
Some things to know…
Dawn Phenomenon vs Somogi’s effect Dawn phenomenon
Blood sugar rises in early morning
Somogi’s (rebound) effect Blood sugar rise in morning as reaction to
hypoglycemic time during the night
Some things to know…
Diabetic foot care Dry, cracked skin + poor circulation
could = loss of a limb
For the most part nurses don’t trim nails of diabetic clients. Refer to Podiatrist.
Typical diabetic foot ulcer
Quick Quiz: 1. Give name of the very important
anabolic hormone that builds up glucose and stores it as glycogen.
2. What is the usable form of sugar in the blood called?
3. What are the cells associated with insulin production called?
4. What is the main problem (physiologically) that exists in people that are diabetic?
.5. Low blood sugar will stimulate what to be released?
6. Describe how someone would look/act if they were hyperglycemic
7.Describe someone who is hypoglycemic
8. List 3 treatments/preventions for diabetes and label if they are for Type 1, 2 or both
9. What is the good news for diabetes?