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Biochemistry > Chapter 3 Fasting state > Flashcards

Chapter 3 Fasting state Flashcards

0
Q

In the fasting state what do the levels in the blood look like

A

⬇️glucose
⬇️insulin
⬆️Glucagon

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1
Q

What occurs in the fasting state

A 
Glucagon is high
Glycogen breakdown
Fat utilization
Protein breakdown 
Brain uses glucose
Muscle uses fat
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2
Q

The fasting state is also known as

A

Basal state

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3
Q

When does the fasting state occur

A

This state occur several hours after the last meal

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4
Q

What secrete glucagon when the glucose and insulin levels drop

A

The pancreas secrete glucagon

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5
Q

What happens when the pancreas secretes glucagon

A

Once the glucagon has been secreted this induces the liver to break down stored glycogen into free glucose

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6
Q

Pancreas secretes Glucagon➡️liver breaks down glycogen to glucose➡️

A

Once the glucose has been freed the glucose leaves the liver and helps maintain blood glucose levels

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7
Q

Pancreas secretes Glucagon➡️liver breaks down glycogen to glucose➡️glucose goes to blood➡️

A

Glucose is then used by the brain for energy needs ….burn down to CO2+ATP

**brain will have plenty of ATP

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8
Q

Pancreas secretes Glucagon➡️liver breaks down glycogen to glucose➡️glucose goes to blood➡️RBCs….

A

The red blood cells breakdown the glucose and turn it into lactate

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9
Q

Pancreas secretes Glucagon➡️liver breaks down glycogen to glucose➡️glucose goes to blood➡️RBCs turn glucose to lactate➡️

A

The lactate released from the red blood cells are sent back to the liver where it is converted from lactate to glucose

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10
Q

Pancreas secretes Glucagon➡️liver breaks down glycogen to glucose➡️glucose goes to blood➡️RBCs turn glucose to lactate➡️ lactate sent to liver to be turned into glucose➡️

A

Glucose is released back to the blood

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11
Q

Between 12 to 24 hours after fast is started where does the blood glucose come from

A

The blood glucose is coming from protein is taken from the muscle so the muscle is atrophying

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12
Q

Amino acids are being sent from the muscle to

A

Amino acid sent from the muscle to the liver through the blood since they are water-soluble

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13
Q

Wednesday amino acids are taken to deliver what happens to them in the blood

A

That amino acids are deaminated into urea

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14
Q

Once the amino acids are converted into urea….

A

Urea - N+ will be carried away as waste and carbons made into glucose (gluconiagenesis)

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15
Q

Once the urea is broken down and carbons are then made into glucose….

A

Glucose leaves the liver and supplies the blood with the glucose it needs to support the brain and red blood cells

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16
Q

During the fasting state we use that coming from

A

Adipose tissue

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17
Q

Triglycerides are broken down from adipose tissue because

A

Because glucagon will simulate hormone sensitive lipase to break down the triglycerides into glycerol

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18
Q

Turning triglycerides into glycerol can be used to make

A

This makes glucose in the liver also known as gluconeogenesis

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19
Q

Fatty acid from triglycerides in the adipose tissue can be

A

Can be used as energy for muscles and liver

20
Q

Protein in the muscles are being used to break down into

A

Amino acids also known as gluconeogenesis to make my glucose

21
Q

This starvation state is where fatty acid’s from adipose tissue turn into

A

Keytone bodies which are highly acidic so they are less desirable but under starvation conditions very useful source of energy

22
Q

Keytone bodies in the starvation state can be used by

A

Keytone bodies can be used by the brain as a source of energy even though the brain prefers glucose but it will use it under starvation condition

23
Q

The glycerol that does come from the adipose tissue is used to

A

Glycerol that does come from adipose tissue is small but it is enough to make glucose that can be released to the blood but mainly used by red blood cells because they can only use glucose and no ketones

24
Q

Red blood cells use

A

Glucose

25
Q

During the starvation state the brain will use

A

Ketone bodies

26
Q

During the starvation state what happens to glucose levels

A

Glucose drops but not dramatically because of gluconeogenesis, lactate, amino acids, glycerol ,and fat

27
Q

What will happen to plasma levels after several days of starvation

A

Glucose levels will lower and the Keytone bodies will greatly increase to make up for the loss of glucose and the fatty acid levels will increase by utilizing fat storage

28
Q

In the urea what happens when glucose is high

A

When glucose is high then the nitrogen output is low

29
Q

In the urea after fasting 12 hours what will you see

A

Putting out more nitrogen due to the burning of protein

30
Q

After starvation for three days what will happen to urea

A

Depending on fat solubility so decrease in protein degradation

31
Q

What happens to urea after starvation for 5 to 6 weeks

A

Not much protein is left and dependent on fat and there’s a decrease in nitrogen

32
Q

How many types of nitrogen waste are there

A

4

33
Q

The types of nitrogen waste are

A

Ammonia- made in kidneys

***Urea- made in liver and filtered by kidneys(most N found)

Utica acid- from breakdown of purines and caffeine

Creatine- made in muscles(interesting form found in urine)

34
Q

Ammonia in nitrogen waste

A

NH4 is about 3%

35
Q

Urea in urine

A

6%

H2N-C-NH2
ll
I

36
Q

Uric acid in urine

A

11% and not very water soluble

Benzene ring with 2N and 1=O with a Pentene ring with 2N and 1=O

37
Q

Creatine in urine

A

Pentene ring with 3N , 1=O, 1=NH, 1-CH3 extending group

38
Q

Creatine phosphate is found in

A

It is found in muscles and used as molecule to quickly replenish ATP

The nonenzymatic decomposition of creatine is simply eliminated as creatinine.

39
Q

Creatine phosphate degradation

A

The degeneration of creatine phosphate into creatine creates a molecule that cannot be used by other pathways so it will be released and filtered by the kidneys

40
Q

Between meals with little to no glucose is entering the blood from the intestines the major source of glucose will be from

A

Glycogen

41
Q

Increase your urea output usually indicates an increased use of

A

Amino acids

42
Q

The starvation state is the same as the fasting state but

A

Keytone bodies become main source of energy

43
Q

During the fasting state amino acids are converted into which molecule

A

Glucose

44
Q

Keytone bodies are made in which organ and from which precursor molecule

A

In the liver from fatty acid’s

45
Q

During the fasting state what happens to insulin levels compared to the Fed state

A

Insulin levels drop

46
Q

Doing the fasting state what is the primary fuel for the brain

A

Glucose

47
Q

When amino acids are burned what waste product is excreted by the kidneys

A

Urea

48
Q

3 types of ketone bodies

A

B- hydroxybutyrate
Acetoacetate
used by muscle & NS

Acetone
expired in breath and not metabolized

Biochemistry (18 decks)

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