cholesterol-lqc 9b

Question 1

where is cholesterol found

Answer 1

in cell membranes

Question 2

what is cholesterols function in the body

Answer 2

regulate fluidity

Question 3

cholesterol is

Answer 3

insoluble

Question 4

lipoproteins are

Answer 4

soluble

Question 5

what is a lipoprotein

Answer 5

Cholesterol combined with triglycerides and protein

Question 6

Which 3 molecules combine to form the lipoprotein in LDL?

Answer 6

Cholesterol, triglycerides and protein (lower % of protein)

Question 7

Which 3 molecules combine to form the lipoprotein in HDL?

Answer 7

Cholesterol, triglycerides and protein (higher % of protein)

Question 8

Saturated or unsaturated fatty acid in triglyceride in LDL

Answer 8

saturated

Question 9

Saturated or unsaturated fatty acid in triglyceride in HDL

Answer 9

unsaturated

Question 10

role in cholesterol transport in LDL

Answer 10

Transports cholesterol from liver to tissues, where it binds to LDL receptors (LDLR) on cell membranes to be taken up by cells (to be used in cell membranes)

Question 11

role in cholesterol transport in HDL

Answer 11

Transports cholesterol from tissues to the liver where it is broken down. Important in decreasing blood cholesterol levels

Question 12

does LDL Increases or decreases risk of atherosclerosis

Answer 12

Increases- Excess LDLs in blood overload LDLRs, so blood cholesterol levels increase
Cholesterol may be deposited in artery walls forming atheromas

Question 13

does HDL Increases or decreases risk of atherosclerosis

Answer 13

Decreases- Helps remove lipid from atherosclerotic plaques

Question 14

What are the consequences of increased saturated fats in the diet?

Answer 14

• Saturated fats may also decrease LDLR activity, so less LDLs are removed from blood.
• Blood cholesterol levels increase further
• More cholesterol deposited in artery walls, so more atheroma formation.