Glycogen Breakdown Regulation in Liver and Muscle

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Questions and Answers

In which scenarios do the liver and muscle primarily use their glycogen stores?

  • The liver breaks down glycogen to provide energy, and muscle breaks it down to produce ketone bodies during fasting.
  • Both the liver and muscle break down glycogen into glucose to maintain blood glucose levels during fasting.
  • The liver breaks down glycogen when blood glucose is low, and muscle breaks it down to release energy. (correct)
  • The liver breaks down glycogen to produce ketone bodies during fasting, while muscle breaks it down to maintain blood glucose levels.

What effect does insulin have on metabolism?

  • Stimulates the production of ketone bodies.
  • Inhibits the production of free fatty acids.
  • Stimulates glycogen synthesis. (correct)
  • Inhibits glucose uptake in muscle.

In an untreated patient with type 1 diabetes mellitus (DM), how are insulin and glucagon concentrations typically affected?

  • Insulin and glucagon are both decreased.
  • Insulin is decreased, glucagon is increased. (correct)
  • Insulin and glucagon are both increased.
  • Insulin is increased, glucagon is decreased.

Which substances are elevated in the blood of untreated patients with type 1 diabetes mellitus?

<p>Acetoacetate and glucose (B)</p> Signup and view all the answers

Which insulin regimen does the depicted graph represent, based on the plasma insulin concentration curves?

<p>Short-acting insulin before main meals (breakfast, lunch, and dinner) and long-acting insulin before sleep. (D)</p> Signup and view all the answers

Which child presenting to the general practitioner should be further investigated for potential new-onset type 1 diabetes mellitus (DM)?

<p>Denzel, a 3-year-old with a history of persistent eczema and recent gastroenteritis, now showing weight loss and increased thirst. (A)</p> Signup and view all the answers

In which cellular compartment does fatty acid oxidation take place?

<p>The mitochondria. (D)</p> Signup and view all the answers

How is cortisol regulation altered in the abnormal situation depicted in the graph?

<p>The production/secretion of cortisol is less sensitive to stimulation by ACTH. (A)</p> Signup and view all the answers

In which cellular compartment does the urea cycle begin, and in which compartment is the end product of the urea cycle formed?

<p>The urea cycle starts in the mitochondrion, while the end product is formed in the cytoplasm. (C)</p> Signup and view all the answers

Which metabolite is NOT used by the liver for its own energy production?

<p>Glucose (D)</p> Signup and view all the answers

Why is glucose homeostasis dysregulated in insulin resistance?

<p>Insulin receptors do not respond properly to insulin. (B)</p> Signup and view all the answers

How is the long-term effectiveness of insulin treatment monitored in patients with diabetes mellitus (DM)?

<p>Monitoring of the HbA1c value. (A)</p> Signup and view all the answers

Hormones from which two structures in the central nervous system regulate the synthesis and excretion of thyroid hormone?

<p>Hypothalamus and pituitary gland (D)</p> Signup and view all the answers

Why is it important to consume enough protein in a low-carb diet?

<p>Protein is needed to prevent muscle breakdown for gluconeogenesis. (C)</p> Signup and view all the answers

A patient with type 2 diabetes mellitus (DM) experiences nocturnal hypoglycemia. Which medication is most likely responsible for this side effect?

<p>A long-acting insulin (B)</p> Signup and view all the answers

Mr. Rigar, 32 years old, has a candida balanitis. His girlfriend has no symptoms. His GP decides to measure his glucose, the glucose level turns out to be 11 mmol/l, despite not being in a fasting state. What conclusion can the GP draw at this time?

<p>Mr. Rigar has diabetes mellitus (DM), most likely type 2. (C)</p> Signup and view all the answers

Which type of regulatory system controls thyroid hormone synthesis and excretion?

<p>Negative feedback (C)</p> Signup and view all the answers

For which of the following patients would it NOT be necessary according to the NHG guidelines, but still be advisable based on data from the Helius study?

<p>A slim 40-year-old Turkish woman with medically treated hypertension. (D)</p> Signup and view all the answers

What is the first-line treatment for a patient with congenital hypothyroidism and very high thyroid-stimulating hormone (TSH) levels?

<p>Oral thyroxine (T4) (A)</p> Signup and view all the answers

Which duct normally regresses in part when the ventral and dorsal pancreas fuse together?

<p>The ductus pancreaticus dorsalis (B)</p> Signup and view all the answers

Which part of a light microscope is used to optimally adjust the contrast of a slide image?

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Which tissue does the histology (HE staining) in the image come from, assuming the tissue has no abnormalities?

<p>Skin (B)</p> Signup and view all the answers

Which adhesion structure of epithelial cells forms the strongest connection between adjacent epithelial cells?

<p>Adherens junction (B)</p> Signup and view all the answers

Which body cavities are separated by the pleuroperitoneal membrane during development?

<p>The lung cavity and the abdominal cavity (D)</p> Signup and view all the answers

Which part of the digestive system is secondarily retroperitoneal?

<p>Duodenum (B)</p> Signup and view all the answers

Which cellular adaptation mechanism in the epidermis underlies callus formation?

<p>Hyperplasia in the stratum basale (D)</p> Signup and view all the answers

Which part of the digestive system originates from the foregut?

<p>Gallbladder (A)</p> Signup and view all the answers

Study the pressure registrations above carefully. What type of motor skills underlies this?

<p>Mass movement contractions (B)</p> Signup and view all the answers

Which process that can occur during cell damage inevitably leads to necrosis of the damaged cell?

<p>Breakdown of the plasma membrane (A)</p> Signup and view all the answers

Which protein activates apoptosis when released from the mitochondria into the cytoplasm?

<p>Cytochrome c (B)</p> Signup and view all the answers

A patient with obesity visits the home doctor because of acid reflux. What drug reduces the acid reflux for the longest time?

<p>Omeprazole (C)</p> Signup and view all the answers

What is a common cause of acute liver failure for adults in western countries?

<p>Medicine toxicity (B)</p> Signup and view all the answers

What underlies the changes in the structure of chromatin in apoptosis?

<p>Degradation of internucleolus RNA (C)</p> Signup and view all the answers

Peroxisomes contain catalase that transfers hydrogenperoxide into water. In which process is hydrogenperoxide produced?

<p>Fatty acid oxidation (B)</p> Signup and view all the answers

Why must a person with diabetes mellites (DM) type 1 be extra careful with alcohol intake?

<p>Excessive alcohol use stops gluconeogenesis. (A)</p> Signup and view all the answers

Which cell type is a Kupffer cell?

<p>Macrofag (C)</p> Signup and view all the answers

How does glutathion protect against oxidative stress?

<p>Glutathion reduces peroxides (A)</p> Signup and view all the answers

What toxic metabolism arises from the oxidization of ethanol?

<p>acetaldehyde (A)</p> Signup and view all the answers

Flashcards

Glycogen breakdown

In liver, glycogen is broken down to provide glucose during fasting. In muscles, glycogen is broken down to provide energy.

Insulin's effects

Insulin promotes glycogen synthesis, stimulating glucose uptake and storage, while inhibiting ketone and fatty acid production.

DM type 1 hormone levels

In untreated type 1 diabetes (DM), insulin levels are decreased while glucagon levels are increased.

DM type 1 blood substances

In untreated DM type 1, acetoacetate is high due to increased fat breakdown and acetyl-CoA accumulates from fatty acid oxidation.

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Insulin injection

Short-acting insulin given before meals with long-acting insulin before sleeping.

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Denzel's symptoms

New onset diabetes mellitus type 1

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Fatty acid oxidation

The location of the vetty acid oxidation.

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Abnormal cortisol regulation

Indicates issue with cortisol stimulation by ACTH.

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Urea cycle compartments

The urea cycle begins in the mitochondria, and the final product is formed in the cytoplasm.

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Liver's energy source

The liver does not use ketone bodies for its own energy production.

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Insulin resistance

Insulin resistance makes insulin receptors unresponsive.

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Monitoring DM with HbA1c

HbA1c value provides long-term glycemic control because it shows average blood glucose over 2-3 months.

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Thyroid synthese regulation

Hypothalamus and pituitary regulate thyroid hormone synthesis and excretion.

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Importance of protein

In low-carb diets, protein prevents muscle breakdown.

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Hypoglycemia risk

Long-acting insulin poses the highest risk for nocturnal hypoglycemia.

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Fingerprick glucose conclusion

A not fasting glucose of 11 mmol/l glucose indicates diabetes mellitus (DM).

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Regulation of hormones

Synthesis and secretion of hormone

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When and who needs glucose bepaling

Vitamine D deficiency

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congenitale hypothyreoïdie treatment

Treatment of congenital is oral thyroxine (T4).

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Pancreas fusion

The ductus pancreaticus dorsalis normally regresses.

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Onderdeel lichtmicroscoop

Contrast is set by M

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What is there tissue off

The skin is an histologie.

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Epitheel cellen

The adherents juction

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welketwee lichaamsholten zijn worden gescheiden

de longholte en de buikholte

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Retroperitoneaal Spijsverteringsstelsel

Duodenum ligt secundair retroperitoneaal gelegen??

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Stratum basale hyperplasie?

Hyperplasie in het stratum basale ligt ten grondslag aan de vorming van eelt??

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Tweede deel colon transversum?

Tweede deel colon transversum ontstaat uit de voordarm??

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motoriek darm

contracties van de muscularis mucosae motoriek

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necrose van de beschadigde cel?

afbraak van de plasmamembraan leid tot necrose van de beschadigde cel??

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Eiwit Cytochroom

Cytochroom activeert apoptose.

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omeprazol/zuurbrand

omeprazol verminder de klachten van zuurbranden het meest langdurig.?

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Wat is de meestal gevallen oorzaak

toxiciteitsreacties op geneesmiddelen?

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chromatine bij apoptose?

afbraak van internucleosomaal DNA structuurveranderingen van chromatine bij apoptose?

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In peroxisomen gevormd?

vetzuuroxidatie.

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patiënt met diabetes mellitus

Waarom moet een patiënt met diabetes mellitus (DM) type 1 die insulinetherapie gebruikt door middel van injectie extra voorzichtig zijn met alcoholgebruik?

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portae

vena portae

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celtype is Kupffer ?

macrophag

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glutathion tegen oxidatieve stress?

Glutathion reduceert peroxides

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Bij oxidatie ethanol

acetoaldehydeontstaat is toxische metaboliet bij oxidatie van ethanol?

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Study Notes

  • Glycogen breakdown is regulated in the liver and muscle

Liver vs. Muscle Glycogen Use:

  • Liver breaks down glycogen to make ketone bodies during fasting and to maintain blood glucose levels
  • Muscle breaks down glycogen to release energy when blood glucose is low
  • Liver glycogen decreases when blood glucose decreases
  • Muscle glycogen decreases to release energy

Insulin Regulation:

  • Insulin is an important regulator of metabolism
  • Insulin stimulates glycogen production

Diabetes Mellitus Type 1:

  • Untreated diabetes mellitus type 1 patients exhibit disrupted insulin and glucagon concentrations
  • Insulin levels decrease while glucagon levels increase

Uncontrolled Diabetes Mellitus (DM) Type 1:

  • Acetoacetate and glucose are elevated

Insulin Administration Regimens:

  • The image presents a short-acting insulin before meals (breakfast, lunch, and dinner) with long-acting insulin before sleep

Diabetes Mellitus (DM) Type 1:

  • A 3-year-old toddler, never visiting the doctor except for severe eczema, recently had gastroenteritis with fever up to 38.5 °C
  • Diarrhea was involved and almost dehydration
  • After the diarrhea he lost weight, drinks a lot and mother worries that it is caused by the diarrhea

Fatty Acid Oxidation

  • The oxidation of fatty acids takes place in the mitochondrion

Cortisol Regulation:

  • The production/secretion of ACTH is less sensitive to inhibition by cortisol

Urea Cycle Location:

  • The urea cycle starts in the mitochondrion
  • The end product is formed in the cytoplasm

Liver Metabolism:

  • The liver does not use ketones for its own energy production

Insulin Resistance

  • Insulin receptors do not respond well to insulin in insulin resistance

Long-Term Monitoring of Diabetes Mellitus (DM):

  • The long-term effect is monitored by checking the HbA1c value in patients with diabetes mellitus (DM) treated with insulin

Hormonal Regulation:

  • The hypothalamus and pituitary regulate thyroid hormone synthesis and excretion in the central nervou system

Low-Carb Diet:

  • It's imporatnt that the diet contains fat and eiwit
  • Protein in the diet prevents muscle breakdown for gluconeogenesis

Hypoglycemia Risk:

  • Using long-acting insulin has the highest risk of hypoglycemia at night for type 2 diabetes

Glucose Measurement

  • For a 32-year-old male with candida balanitis and a glucose level of 11 mmol/l
  • The diagnosis is not clear with this result, dhr. Rigar must go to the laboratory for venous glucose determination

Thyroid Hormone Regulation:

  • Tthe production and secretion of thyroid hormone is controlled by negative feedback.

Selective Case Finding:

  • According to the NHG standard, screening for diabetes mellitus (DM) should not be done for a slender 40-year-old Turkish woman with medicated hypertension.
  • However, it is advisable based on data from the Helius study

Congenital Hypothyroidism Treatment:

  • The treatment of choice for a patient with congenital hypothyroidism and a strongly elevated TSH (thyroid stimulating hormone) plasma concentration is oral thyroxine (T4)

Pancreas Ductus Regression:

  • The ductus pancreaticus dorsalis regresses when the ventral and dorsal pancreas fuse

Light Microscopy Contrast:

  • Part "N" is used to optimally adjust the contrast of the image of the slide

Histology Identification:

  • This is a sample of skin

Epithelial Cell Adhesion:

  • The most stable adhesion structure is the adherens junction

Pleuroperitoneal Membrane:

  • The pleuroperitoneal membrane separates the lung cavity and the abdominal cavity during development

Digestive System - Retroperitoneal Location:

  • The duodenum is secondarily retroperitoneal located in the digestive system

Epidermal Adaptation:

  • Callus formation is based on hyperplasia in the stratum basale

Foregut Derivatives:

  • Structures such as galways are found in the foredarm

Intestinal Motor Function:

  • The pressure registrations point to mass movement contractions

Necrosis

  • Irreversible damage to the plasmamebrane can progress necrsosis

Apoptosis

  • Cytochrome c promotes apoptosis after it is released

Heartburn

  • Omeprazole decreases heart burn

Liver Failure

  • Toxic reactions to a medicine cause acute liver failure in western countires

Apoptosis Mechanism

  • Fragmentation of the internucelosomal DNA is found in this type of cell destruction

Toxins

-Fatty acid oxidation occurs by toxins

DM alcohol use

  • It inhibits gluconeogensis

Vena Portae

  • Vena portae is a marker

Kupffer Cell:

  • A Kupffer cell is a macrofague

Glutathione Protection:

Glutathione reduces peroxides

Alcohol Oxidation:

  • Acetaldehyde is a toxic metabolite of ethanol oxidation

Muscle Cell Regeneration Rankings:

  • Smooth muscle has the highest capacity to regenerate quickly, followed by skeletal muscle and then heart muscle

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