CLINICAL CHEMISTRY Flashcards
GIVE 4 FUNCTIONS OF LIPID
✓ Composed of mostly carbon-hydrogen (C-H) bonds
✓ Primary source of fuel
✓ Provides stability to cell membrane and allow for transmembrane transport
✓ Insoluble in blood or plasma, but soluble in organic solvents.
___ are commonly referred to as “fats” and are insoluble to blood
LIPIDS
The _____ carry lipids, allowing circulation of lipids to different
parts of the body
LIPOPROTEINS
Needed to transfer lipids to the ____, _____, ______
LIVER
CELLS
TISSUE
3 LIPOPROTEINS TRANSPORTERS:
✓ High Density Lipoproteins (HDL)
✓ Low Density Lipoproteins (LDL)
✓ Very Low Density Lipoproteins (VLDL)
5 MAJOR LIPIDS
- Fatty acids
- Triglycerides
- Phospholipids
- Cholesterol
- Fat-soluble Vitamins (A, D, E, K)
Mostly found as constituents of phospholipids or triglycerides
Mainly derived from the hydrolysis of triglycerides in the adipose tissue
FATTY ACIDS
FATTY ACIDS, Linear chains of ____ bonds that terminates with ____
C-H
-COOH
2 FUNCTIONS OF FATTY ACIDS
Important source of energy
Provides substance for the conversion of glucose (gluconeogenesis)
CLASSIFICATION OF FATTY ACIDS
ACCORDING TO THE PRESENCE OF ESTER BONDS:
UNESTERIFIED
ESTERIFIED
BOUND TO ALBUMIN
UNESTERIFIED
constituent of triglycerides or phospholipids
ESTERIFIED
ACCORDING TO THE NUMBER OF FATTY ACID STRUCTURE/ SIZE:
SHORT
MEDIUM
LONG CHAIN
8-12
MEDIUM
> -12
LONG CHAIN
SHORT
4-6
ACCORDING TO THE NUMBER OF DOUBLE BONDS:
SATURATED
UNSATURATED:MONOSATURATED
UNSATURATED:POLYSATURATED
NO DOUBLE BONDS
2 EXAMPLE
SATURATED
EX. BUTYRIC ACID, GLYCEROL
ONE DOUBLE BOND
UNSATURATED: MONOSATURATED
EX. OLEIC ACID
TWO OR MORE DOUBLE BONDS
UNSATURATED: POLYSATURATED
EX. LINOLEIC ACID
OTHER EXAMPLES OF FA:
PALMITIC ACID
STERIC ACID
ARACHIDONIC ACID
Contains saturated fatty acids or unsaturated fatty acids
Very hydrophobic/ water insoluble/ neutral lipid
Do not contain charged groups or hydrophilic groups
TRIGLYCERIDES
Main storage of lipid in man; chiefly found in ____
TRIGLYCERIDES
adipose tissue
_____ of the stored fat in the body is in this form
95%
The predominant form of triglyceride in the plasma is _____
GLYCERYL ESTER
When triglyceride is broken down/ catabolized, it will release______ , and used by the cells as a source of fuel or energy
fatty acids
It is able to provide insulation (excellent insulator)
TAG
Facilitated by enzymes and hormones for breakdown:
HORMONES:
Epinephrine and Cortisol
Facilitated by enzymes and hormones for breakdown:
o Enzyme:
Lipoprotein Lipase (LPL)
An average person ingests, absorbs, resynthesizes, and transports about _____ of TAG daily
FASTING REQUIREMENT: _____ hours
60-130g
10-12HRS
evaluates suspected _____ and measures the body’s ability to metabolize fat
atherosclerosis
Fasting TAG ______ are at risk for ______
because of atherogenic VLDL remnants
≥ 200 mg/dL
Coronary Artery Disease
2 most important lipids in the management of CHD
TAG
CHOLESTEROL
One TAG has ___ fatty acids attached to ___ glycerol structure by ester bonds
THREE
ONE
TAG IS A.K.A
TRIACYLGLYCEROL or NEUTRAL FAT
PHOSPHOLIPIDS IS A.K.A
CONJUGATED LIPIDS
___ molecule of phospholipid has ___ fatty acids attached to ___ phosphorylated glycerol
ONE
TWO
ONE
___ position contain phospholipid head groups
THIRD
MOST ABUNDANT LIPID IN THE BODY
PHOSPHOLIPIDS
PHOSPHOLIPIDS IS DERIVED FROM
PHOSPHATIDIC ACID
contain hydrophilic and hydrophobic head groups
Amphipathic
makes phospholipids soluble in water
present on the outer part (directly exposed to
plasma and water); polar region
HYDROPHILIC
____ is present on the inner part; nonpolar region
HYDROPHOBIC
PHOSPHOLIPIDS ORIGINATES IN THE
LIVER AND INTESTINE
Not part of the lipid profile as it is not routinely measured
The measurement would only provide little information in the diagnosis on lipid abnormality on metabolism
PHOSPHOLIPIDS
PHOSPHOLIPIDS IS MEASURED IN?
FETAL LUNG MATURITY
Collection of ____ (especially in the ____ of pregnancy)
and the phospholipids are measured
amniotic fluid
third trimester
phospholipids also participates in ___ and ____
cell metabolism and blood coagulation
3 forms of phospholipids
LECITHIN
SPHINGOMYELIN
CEPHALIN
aka phosphatidylcholine
the major of phospholipid which is ___ of the phospholipid in the body
LECITHIN
70%
___ of the phospholipidin the body
The ONLY phospholipid in membranes that is NOT derived from
glycerol but from an amino alcohol called ____
20%
sphingosine
sphingomyelin Accumulates in the liver and spleen of patients suffering from _____
Serves as a reference material during ____ of pregnancy because
its concentration is constant as oppose to lecithin
Neimann-Pick Disease
3rd trimester
10% of the phospholipids in the body
cephalin
Unsaturated steroid alcohol contains four rings, component of steroids
Found on the surface of lipid bilayers of the cell membrane
Important constituent in the assembly of cell membrane and
bile acid
cholesterol
cholesterol is a.k.a
3-HYDROXY-5, 6 CHOLESTENE
contributes to the metabolism/ digestion of fats in the intestine
bile acid
Not catabolized by most cells
Does not serve as source of fuel or energy of the cells
The excess cholesterol in the cell is recycled and is either released in the blood or transported back to the liver
cholesterol
2 forms of cholesterol
unesterified
sterified
FREE CHOLESTEROL (amphipathic)
____ of the total cholesterol in the body (minor form)
UNESTERIFIED
30%
Present in the ____,___,____
Polar type
Produced via ____ and becomes available for
membrane, hormone, and bile acid synthesis
plasma or serum, and RBCs
lysosomal hydrolysis
CHOLESTEROL ESTER (neutral lipid)
_____ of the total cholesterol in the body (major form)
also present in ___,___
esterified
70%
serum and plasma
Important for the esterification of cholesterol
Catalyzes the esterification of cholesterol by promoting the
transfer of fatty acids from lecithin to cholesterol
LCAT: lecithin-cholesterol acyl tranferase
LCAT RESULTING PRODUCT:
SYNTHESIZED IN:
ACTIVATOR:
lysolecithin and cholesterol esters
LIVER
APO A-1
Excess cholesterol is re-esterified by the microsomal enzyme ____ and is stored until it is needed
acyl – cholesterol acyl transferase (ACAT)
CHOLESTEROL IS THE PRECURSOR FOR THE FORMATION OF: 4 ANSWER
BILE SALTS
STEROID HORMONES
VITAMIN D (CHOLECALCIFEROL)
CELL MEMBRANE
Directly measured with reagent
All components of analytes are measured
(esterified and unesterified)
TAG
____ (good chole) measured directly with reagent & machine ____ and ___ are not directly measured with reagent, these are calculated/computed, but separated in costs
HDL
VLDL AND LDL
_____ : routinely measured
_______ is essential in the diagnosis of lipoprotein diseases and management of lipoprotein disorders and lipid abnormalities
CHOLESTEROL
TOTAL CHOLESTEROL