21. Fatty acids in the bloodstream that are NOT part of TAGs or phospholipids: (

Question

21. Fatty acids in the bloodstream that are NOT part of TAGs or phospholipids: (Select ALL that apply!)

Are present at levels that are independent of epinephrine, glucagon, or insulin levels

Are carried by the protein albumin

Are soluble in the aqueous phase of the blood in free form

Are nonexistent; the blood only carries ketone bodies

Are carried as part of the lipid bilayer of LDLs and chylomicrons

Originate primarily from stored TAGs in adipose tissue

Originate primarily from dietary fats that have just been released into the bloodstream from intestinal cells

Explanation / Answer

Free fatty acids in blood are generated from lipolysis of triglyceride stores in adipose tissue, which is activated by epinephrine and glucagon, the free fatty acids generated enter the blood and is transported throughout the body bound to albumin( as they are insoluble in aqueous phase of blood).

Whereas Dietary fatty acids are absorbed into the blood via intestinal cells and long chain fatty acids are transported in chylomicrons ( in the core of chylomicrons and LDLs and not embedded in their lipid bilayer).

Hence options options B,F&G are correct.

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