Lipids Not Saponifiable and Steroid Hormones
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Questions and Answers

Which of the following is NOT a category of nonsaponifiable lipids?

  • Carotenoids
  • Triglycerides (correct)
  • Steroids
  • Prostaglandins
  • The basic structure of steroids is the ______.

    ciclopentanoperhidrofenantreno

    Steroids are directly related to triglycerides, phospholipids, and sphingolipids.

    False (B)

    Which of the following is NOT a major type of steroid?

    <p>Amino acids (B)</p> Signup and view all the answers

    What is the common name for the steroid that is a crystalline substance insoluble in water?

    <p>Cholesterol</p> Signup and view all the answers

    What is the nickname for LDL?

    <p>Bad cholesterol</p> Signup and view all the answers

    What are the functions of the hormones produced by the adrenal cortex?

    <p>Regulation of glucose synthesis, breakdown of fats and proteins, and excretion of water and electrolytes.</p> Signup and view all the answers

    Match the following eicosanoids with their roles:

    <p>Prostaglandins = Retention of fluids, control of blood pressure, regulation of blood circulation Leucotrienes = Inflammation and allergic reactions Tromboxanes = Platelet aggregation and vasoconstriction</p> Signup and view all the answers

    Eicosanoids are derived from fatty acids with 20 carbon atoms.

    <p>True (A)</p> Signup and view all the answers

    What is the structural feature that differentiates different prostaglandin families?

    <p>The type and number of oxygen-containing substituents on the cyclopentane ring.</p> Signup and view all the answers

    Which of these statements about terpenes is accurate?

    <p>Terpenes contribute to the color of some foods. (A)</p> Signup and view all the answers

    Which of these is NOT a type of fat-soluble vitamin?

    <p>Vitamin C (B)</p> Signup and view all the answers

    Humans can produce all the fat-soluble vitamins they need.

    <p>False (B)</p> Signup and view all the answers

    What are the main functions of vitamin A?

    <p>Vision, reproduction, growth, and tissue maintenance.</p> Signup and view all the answers

    What is the primary function of vitamin D?

    <p>Regulation of calcium and phosphorus absorption for bone development and maintenance.</p> Signup and view all the answers

    What is the main role of Vitamin E in the body?

    <p>Protection against oxidative damage to cells.</p> Signup and view all the answers

    What is the primary role of Vitamin K in the body?

    <p>Coagulation of the blood.</p> Signup and view all the answers

    Flashcards

    Steroids

    Lipids that are structurally unrelated to triglycerides, phospholipids, and sphingolipids, typically containing 17 carbon atoms.

    Sterols

    A category of steroids, including cholesterol.

    Cholesterol

    A crystalline, water-insoluble sterol, crucial for many bodily functions.

    LDL

    Low-density lipoprotein, often called "bad cholesterol," carrying cholesterol to cells.

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    Hormones

    Chemical messengers influencing bodily functions.

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    Eicosanoids

    Lipid compounds derived from arachidonic acid, encompassing prostaglandins, leukotrienes, and thromboxanes.

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    Prostaglandins

    Eicosanoids found in all tissues, playing roles in blood pressure, fluid retention, and blood circulation.

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    Tromboxanes

    Eicosanoids that oppose prostaglandins in their effects, stimulating platelet aggregation and vasoconstriction.

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    Leucotrienes

    Eicosanoids involved in inflammation, allergic, and anaphylactic reactions; produced by 5-lipoxygenase.

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    Carotenoids

    Small lipid compounds responsible for the colors of fruits and vegetables, found in animals too.

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    Vitamin A

    Essential for vision, reproduction, growth, maintenance of epithelial tissues.

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    Vitamin D

    Steroid-like hormones that regulate calcium and phosphorus for bone development.

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    Vitamin E

    Antioxidant vitamins preventing cellular component oxidation, known as tocopherols.

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    Vitamin K

    Essential for protein modification in blood clotting.

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    Bile acids

    Derivatives of cholesterol, involved in fat digestion.

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    Terpenes

    Grouped as either carotenoids or various vital vitamins.

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    Arachidonic Acid

    Precursor molecule for eicosanoid production.

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    Liposoluble Vitamins

    Vitamins that are dissolved in fats.

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    Adrenal Cortex

    Part of the adrenal gland stimulating glycogen synthesis and fat/protein breakdown.

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    Cortisol

    Hormone that regulates water and salt excretion through kidneys.

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    Androgens

    Hormones controlling egg maturation and sexual development.

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    Study Notes

    Lipids Not Saponifiable

    • Lipids not saponifiable include: Steroids, prostaglandins, leucotrienes, thromboxanes, carotenoids, and lipid vitamins.
    • Steroids are not related to triglycerides, phospholipids, or sphingolipids; they share a basic structure of 17 carbon atoms.
    • Important steroids include: sterols, bile acids, female and male sex hormones, corticosteroid hormones, and vitamin D.
    • Cholesterol is a well-known sterol. It is a crystalline substance insoluble in water.
    • LDL ("bad cholesterol") is a low-density lipoprotein that transports cholesterol to cells.

    Steroid Hormones

    • Adrenal cortex hormones stimulate glycogen synthesis and fat breakdown, and affect protein metabolism
    • Cortisol is a stress hormone
    • Androgens (e.g., testosterone) and estrogens/progesterone affect sexual development and function.

    Eicosanoids

    • Prostaglandins, leukotrienes, and thromboxanes are eicosanoids derived from 20-carbon fatty acids (primarily arachidonic acid).
    • Prostaglandins are crucial in various physiological processes, including regulating blood pressure, blood clotting, and inflammation.
    • Prostaglandins were first isolated from the prostate, and are found in all tissues.
    • They play crucial roles in medicine and pharmacology.
    • Prostaglandins influence blood pressure and blood circulation.

    Leukotrienes

    • Leukotrienes are involved in various inflammatory responses and allergic reactions.

    Thromboxanes (TX)

    • Thromboxanes are powerful metabolites of prostaglandins that stimulate platelet aggregation and vasoconstriction.

    Carotenoids

    • Carotenoids are pigments that give color to foods.
    • They are insoluble in water and are a source of vitamin A.

    Vitamins (Lipophilic)

    • Vitamins A, D, E, and K are fat-soluble vitamins.
    • Vitamin A is vital for vision and growth, derived from carotenoids.
    • Vitamin D regulates calcium and phosphorus absorption, critical for bone formation.
    • Vitamin E acts as an antioxidant by preventing premature cell damage.
    • Vitamin K is crucial for blood clotting.

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    Description

    Explore the fascinating world of non-saponifiable lipids, including steroids and eicosanoids. This quiz covers crucial concepts such as the structure of steroids, the role of adrenal cortex hormones, and the significance of lipid vitamins. Test your knowledge and understanding of these important biochemical compounds.

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