Exam 5 Flashcards
What are some properties we can use to classify carbohydrates?
How many carbons, C=O functional group location, # of sugar units, sterochemistry
Trioses
3-C sugars
Tetroses
4-Carbon sugars
Pentoses
5-Carbon sugars
Hexoses
6 C sugars
What are the monosaccharide components of the disaccharides maltose, lactose, and sucrose?
Maltose = glucose + glucose
Lactose = glucose + galactose
Sucrose = Glucose + fructose
Decribe Fisher projection vs Haworth
Fisher linear
Haworth- closed shape usually hexagon
What functional group is used to classify carbs
Carbonyl C=O
What is the difference between D-glucose and L-glucose
D- OH on 5th C is to the right
L- OH on the 5th C is to the left
How many sugar units in oligosaccharides, polysaccharides?
Oligo- 3-10 sugar units
Poly- more than 10 monosaccharides
D-glucose and L-glucose are what in relation to each other
Isomers
Name 4 examples of polysaccharides
Starch, glycogen, cellulose, chitin
Define and name a few examples of types of glycoproteins
Oligosaccharides bonded to membrane proteins
Antibodies
Hormones
Coagulation factors
What is needed for a carb to be a reducing substance
The sugar must have a free ketone or aldehyde group
Most ingested carbs are __
Polymers
____ breaks the polymers down into dextrins and disaccharides
amylase
Where to monosaccharides go after they are digested and absorbed
The liver
___ is the only carb that is used or stored directly
Glucose
What is the primary source of energy in humans
glucose
What is the general reaction for the 1st metabolic pathway
What are the end products
Embden- Meyerhof Pathway
Aerobic- 32 mols of ATP from 1 mol glucose – glucose to pyruvic acid
Anaerobic- 2 mols of ATP from 1 mol of glucose – glucose to lactic acid
What is the general reaction for the 2nd metabolic pathway
What are the end products
Hexose Monophosphate shunt- G6p to 6 phosphogluconic acid, enzyme G6p dehydrogenase
NADPH and ribose 5 phosphate
What is the general reaction for the 3rd metabolic pathway
What are the end products
Glycogenesis
G6P –> glycogen
What metabolic pathway for glucose can produce the sugar used in nucleotide synthesis?
Hexose monophosphate- ribose 5 phosphate is used in nucleotide synthesis
What is the storage form of glucose?
Glycogen
What tissues are capable of storing glycogenesis and glycogenolysis
Genesis- Liver and muscle
Lysis- Liver
What metabolic process occurs during short fasting period
glycogenolysis
gluconeogenesis
What metabolic process occurs during prolonged fasting
gluconeogenesis
What metabolic process occurs during postprandial
after a meal
glycogenesis
lipogenesis
Glucagon is a ___
secreted by ___
and it increases _____
And it also increases ____
hormone
alpha langerhans
Glucogenolysis
Gluconeogenesis
Growth hormone is secreted by
the anterior pituitary
ACTH is secreted by
anterior pituitary
Somatostatin is secreted by ____
and is the intermediate between glucagon and ____
pancreas
insulin
Which of these ___ increase glucose blood levels, which ones decrease
glucagon
epinephrine
growth hormone
ACTH
Somatostatin
cortisol
thryoxine
human placental lactogen
insulin
all hormones!
all increase glucose expect for insulin
Epinephrine is secreted by
adrenal cortex
Cortisol is secreted by
the adrenal cortex
Thyroxine is secreted by
thyroid gland
human placental lactogen is secreted by
placenta
insulin is secreted by
Beta cells of langerhans
What hormones when overproduced mimic diabetes symptoms
cortisol and thyroxine
What component is lost when converting preproinsulin into proinsulin
the process is called
signal sequence
proteolysis
What component is lost when converting proinsulin into mature insulin
C-peptide
Increase in plasma glucose levels due to defects in insulin secretion, action or both causes ___ resulting in the disease
hyperglycemia
diabetes mellitus
signs and symptoms of hyperglycemia
increased or decreased?
thirst
urination
appetite
all increased
blurred vision
slow healing wounds
numbness, tingling in feet
rapid breathing
decreased consciousness-coma
hyperglycemia
Diabetes Mellitus is Type #
___ dependent
1 insulin dependent
2 non insulin dependent
Destruction of beta pancreas cells from an autoimmune condition can be a triggering event for___
DM
people with diabetes mellitus are prone to ___
DKA diabetic ketoacidosis
What occurs in DKA
severe hyperglycemia
peeing out glucose
thirst
body uses fatty acids for energy instead
results in acidosis, high ketones, elevated glucose levels
Type 2 diabetes is when
enough insulin is produces but there is no response to it
diabetes type ___ has intact beta cells
type 2
diabetes type ___ has less severe symptoms
2
What is the treatment for type 1? and type 2?
1- insulin
2- lifestyle changes
Type ___ that is out of control can lead to HHS
2
HHS occurs most commonly in pts with _____ that leads to ___
febrile illness
decreased fluid intake
The breakdown of what compounds result in the production of ketones?
fatty acids
Type ___ is more prevalent in juveniles and type ___ is more prevalent in adults
1
2
What is GDM
gestational diabetes mellitus
hyperglycemia during pregnancy
How does gestational Diabetes Mellitus affect the infant
can give it hyperglycemia, makes too much insulin
more likely if large babies, in past still birth,
What causes secondary diabetes
genetic defects of beta cell function
or caused by secondary diseases like pancreatic or endocrine
What endocrine diseases increase glucose levels
hyperthyroidism
cushing’s syndrome
acromegaly
What is the leading cause of death in diabetics
heart disease
What are the severe complications that can occur after longterm hyperglycemia
renal failure
stroke
blindness
What part of the body cannot store its own glucose
Central nervous system
Main symptoms of hypoglycemia?
dizziness, blurred vision, sweating, nausea, headaches
What 3 symptoms diagnose hypoglycemia
low glucose
symptoms when glucose is low
no symptoms when glucose returns to normal
Not eating after consuming insulin can cause____, this is the most common cause in ___
hypoglycemia
adults
What are the causes of hypoglycemia in neonates
premature, maternal toxemia, maternal diabetes
What is the most common diabetes mellitus
type 2
What is the optimal specimen for glucose testing? Why isn’t this specimen used more frequently?
glucose dehydrogenase
most specific
Most common method of measuring glucose
hexokinase
What 2 factors determine glycosylated hgb levels
to find average glucose
RBC lifespan 2-3 months
What test calculates the estimated average glucose
Hgb A1C
What are the main criteria to diagnose diabetes
fasting plasma glucose >126
2h plasma glucose >200
random glucose >200
What tests are alternatives to find average glucose
fructosamine
best for pts with chronic DM
elevated ___ is one of the most common reasons for an elevated osmolality
glucose
What type of diabetes, chronic or acute
glycolsylated Hgb A1C
fructosamine
urinary protein and microalbumin
kidney function
chronic DM
What type of diabetes chronic or acute
glucose
ABG
electrolytes
ketones
lactate
osmo
kidney function
acute DM
What are lipids made of
What are their functions
CH bonds
storing energy, cell membranes
no double C bonds, straight mol
kinks- double bonds
saturated
unsaturated
Trans vs cis fatty acids
trans- Hs on opposite sides
cis- Hs on same side
No charge or polar groups are
____ like triglycerides
hydrophobic
Are Triglycerides cis or trans, saturated or unsaturated
cis unsaturated
Are Triglycerides cis or trans, saturated or unsaturated
cis unsaturated
oils
inositol
serine
ethanolamine
phospholipid head groups ***
How do phospholipids react to water
amphipathic
Is cholesterol, saturated or unsatured
unsaturated
How does cholesterol react to water
amphipathic
cholesterol is usually synthesized by
animals
Is cholesterol a source of fuel?
no
What compound is used as the precursor for the steroid hormones and vitamin D3?
cholesterol
What is cholesteryl ester?
esterified form of cholesterol for storage
lipid that has a role in blood clotting
prostaglandin
lipid that is an intermediate of cholesterol, associate with carrots
terpenes
larger lipoproteins have ____ core regions and ____ amounts of triglyceride and cholesterol esters
large
large
put lipids in order of biggest to smallest
Very low density lipoproteins
chylomicrons
high density lipoproteins
low density lipoproteins
biggest
chylomicrons
very low
low
high
smallest
3 steps of lipid pathway
- absorption in intestine
2 exogenous in chylos to liver
3 endogenous in VDL to LDL
4 reverse transport in HDL
How are exogenous triglycerides transported in plasma?
chylos
How are endogenous triglycerides transported in plasma?
LDL
What is the main function of lipoproteins
deliver dietary lipids to the liver
lipoproteins are rich in
triglycerides
What produces VLDL
the liver
What is the reason that hyperlipidemic specimen become turbin
VLDL
VLDL- the major carrier of ___ triglycerides
endogenous
what is iDL
intermediate- we dont care or see it often
What is the main carrier of cholesterol to the peripheral cells
LDL
Who is good and who is bad
LDL
HDL
H for happy HDL - good
LDL- bad
Is LDL small or large?
small, cna get into vessel walls
What is the smallest and most dense lipoprotein particle
HDL
least amount of lipids, most amount of protein
HDL
Where is HDL synthesized?
liver and intestine
What is the main function of HDL
remove excess cholesterol from peripheral cells
Match: hypo, tangier or abeta
low LDL
low LDL
low HDL
abetalipoproteinemia
hypobetalipoproteinemia
tangier disease
What enzyme hydrolyzes triglycerides?
LIPASE
What is the formula to calculate LDL
LDL= cholesterol - HDL - (triglycerides/5)
What are the 3 ketone bodies
acetone
acetoacetate
beta hydroxybutyric acid