Lipid Transport, Byproducts Of Energy

Question 1

Classes of lipoproteins

Answer 1

Chylomicrons
VLDL
LDL
HDL

Question 2

What is a chyolomicron

Answer 2

Formed by enterocytes lining the
intestine
• Combine triacylglycerols fromfood with specific apoproteins
• Carry lipids from diet to tissues –
especially adipose tissue
• Normally only present in blood
4 – 6 h after a meal

Question 3

What is a VLDL

Answer 3

Formed in liver for storage of energy
• Rich in triacylglycerols
• Combine triacylglycerols synthesised in liver with specific apoproteins
• Carry lipid from liver to tissues – mainlyadipose tissue

Question 4

What is LDL

Answer 4

Formed in liver
• Cholesterol rich
• Combine cholesterol synthesised in liver withspecific apoproteins (Apo B100 is important)
• Carry cholesterol to tissues from liver
Increased = increased Risk of atherosclerosis

Question 5

What is HDL

Answer 5

• Formed in tissues
• Cholesterol from tissues combined with
specific apoproteins
• Carry excess cholesterol back fromtissues toliver

Question 6

What are the classes of hyperlipoproteinaemia

Answer 6

Type I - defect in lipoprotein lipase so chyolomicrons persist
Type II (a and b) A - high ldl (defect receptor) b high VLDL and LDL
Type III
Type IV
Type V

Question 7

What are the classes of lipids

Answer 7

Trigs
Fatty acids
Cholesterol 
Cholesterol esters 
Phospholipids