Module 8 - 2 Flashcards
What are sterols?
Sterols are structural membrane lipids.
What is the structure of sterols?
Four fused ring steroid nucleus: 3-six carbon rings and a 5-carbon D ring.
What are the active roles of lipids?
Intracellular signaling molecules, hormones, enzyme cofactors, pigments, and vitamins.
What is the function of phosphatidylinositol?
Acts as an intracellular signal.
What is the function of eicosanoids?
Paracrine hormones that act on cells near point of production.
What are the three classes of eicosanoids?
Prostaglandins, thromboxane, and leukotrienes.
What are steroid hormones?
Hydrophobic oxidized sterol derivatives that alter patterns of gene expression and metabolism.
What are lipid vitamins?
A, D, E, K; highly hydrophobic with different functions.
What is the function of Vitamin D?
Regulates Ca2+ uptake and deposition.
What are the sources of Vitamin D?
Diet or endogenous production
What is the consequence of insufficient Vitamin D?
Skeletal defects (Rickets)
What are the sources of Vitamin A?
Liver, egg yolks, and milk products
What are the three forms of Vitamin A?
Alcohol (retinol), aldehyde, and retinoic acid
What is the role of retinal in vision?
Light-sensitive compound
What causes ‘Red Eye’ in photos?
Retinal
