Chapter 2.4 Lipids Flashcards

1
Q

Lipid

A

Hydrophobic organic molecule made of carbon and a high ratio of hydrogen to oxygen

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2
Q

Lipids are less ______than carbohydrates and thus have more________

A

Less oxidized and have more calories per gram

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3
Q

Five primary types of lipids in humans

A
  1. Fatty acids
  2. Triglycerides
  3. Phospholipids
  4. Eicosanoids
  5. Steroids
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4
Q

Fatty acid

A

Chain of 4 to 24 carbons with a carboxyl group and a methyl group at either end. Saturated or unsaturated

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5
Q

Saturated fatty acid

A

Has as much hydrogen as it can carry

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6
Q

Unsaturated fatty acids

A

Hydrogen can be added to this molecule because some double covalent bonds

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7
Q

Polyunsaturated fatty acids

A

Multiple double carbon to carbon covalent bonds

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8
Q

Essential fatty acids

A

Obtain from diet, cannot synthesize them

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9
Q

Glycerol

A

A three carbon alcohol

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10
Q

Triglyceride

A

A glycerol linked to three fatty acids which makes it neutral; links formed by dehydration synthesis. 

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11
Q

Triglycerides are broken down by_____

A

Hydrolysis reactions

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12
Q

Triglycerides are also known as______

A

Neutral fats

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13
Q

Which fats contribute more to cardiovascular disease?

A

Saturated fats

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14
Q

Primary function of fat

A

Energy storage

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15
Q

Primary function of fat in adipose tissue

A

Thermal insulation and shock absorbing cushion for organs

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16
Q

Phospholipids are made of

A

Glycerol, two fatty acid tails, and a phosphate group which links to other functional groups

17
Q

Nature of phospholipids

A

Clothespin: Tails are hydrophobic head is hydrophilic…so amphipathic

18
Q

Most important function of phospholipid

A

Structural foundation of cell membranes

19
Q

Eicosanoids structure

A

20 carbon compounds derived from arachidonic acid

20
Q

Eicosanoids primary function

A

Hormone like chemical signals between cells

21
Q

Prostaglandins function and shape

A

-Functionally diverse Eicosanoids (signaling in inflammation, blood clotting, hormone action, labor contractions, Control of blood vessel diameter, etc.)
-Five of the 20 carbon atoms arranged in a ring

22
Q

Steroid

A

Lipid with 17 of its carbon atoms arranged in four rings

23
Q

Cholesterol

A

Parents steroid from which other steroids are synthesized:
Cortisol, progesterone, estrogens, testosterone, and bile acids

24
Q

We obtain dietary cholesterol from __________

A

Foods of animal origin

25
Cholesterol functions
Precursor of other steroids Important component of cell membranes: required for proper nervous system function
26
Where is cholesterol primarily synthesized
the liver
27
Function of bile acids
Steroids that aid in fat digestion and nutrient absorption
28
Cholesterol function
Component of cell membranes and precursor of other steroids
29
Eicosanoids function
Chemical messenger between cells
30
Fat soluble vitamins A, D, E,K function
Blood clotting, wound healing, vision, calcium absorption, etc.
31
Fatty acids Function
Precursor of triglycerides; source of energy
32
Phospholipids Function
Major component of cell membranes; aid in fat digestion
33
Steroid hormones Function
Chemical messengers between cells
34
Triglycerides function
Energy storage thermal insulation filling space binding organs together cushioning organs