Ch. 8 Flashcards Preview

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Flashcards in Ch. 8 Deck (38):
1

the smallest physical units of a substance are

atoms

2

carbon and hydrogen are two examples of

atoms

3

in an atom, the nucleus has a positive charge and the electrons orbiting around the nucleus have a ___ charge

negative

4

a chemical reaction in which atoms lose electrons is

oxidation

5

what is not true about free radicals

our body has no mechanism to combat free radicals

6

what is an exchange reaction

a two-part metabolic reaction that involves a loss and gain of electrons

7

free radicals

are formed by exposure to air polllution and tobacco smoke

8

what is a required componet of an antioxidant enzyme system

antioxidant minerals

9

how do antioxidant minerals stabilize free radicals

break down and convert them to less damaging molecules

10

what disease has not been linked to free radical damange

type 1 diabetes

11

examples of antioxidant enxyme systems include superoxide dismutase, ___, and glutathione peroxidase

catalase

12

the most powerful and abundant form of vitamin e is

alpha-tocopherol

13

which water-soluble vitamin can regenerate vitamin e after it has been oxidized

vitamin c

14

about 90% of vitamin e is stored in

adipose tissue

15

what is not a function of vitamin e

improving the absorption of vitamin c if dietary intake is low

16

what food is rich in sources of vitamin e

mayonnaise, begetable oils, nuts, and seeds

17

taking vitamin e suplements along with ___ can cause uncontrollable bleeding

anticoagulants

18

a deficiency of ___ can result in the erythrocyte hemolysis, leading to anemia

vitamin e

19

what nutrient requires the most frequent consumption to assure adequate body stores

vitamin c

20

the deficiency disease associated with vitamin c is

scurvy

21

what is false about vitamin c

smokers sould consume less vitamin c than non smokers

22

what increases the rda fro vitamin c

smoking cigarettes

23

what cooking method would destroy the most vitamin c in food

boiling

24

what is a rich source of vitamin c

green and red peppers

25

consuming even moderately excessive doses of vitamin c supplements would be most harmful to individuals suffering from

hemochromatosis

26

symptoms of a vitamin c deficiency include

bleeding gums and loose teeth

27

beta-carotene is a precursor of

retinol

28

what is not true about carotenoids

beta-carotene is the only cartenoid that functions as an antioxidant

29

most of the bodys vitamin a is stores in the

liver

30

the most critical role that vitamin a plays in the human body is

maintaining healthy vision

31

the light sensitive pigment found in rod cells is formed by retinal and opsin is

rhodopsin

32

what food would be the best dietary source of preformed vitamin a

egg

33

both keshan disease and kashin-beck disease are associated with a ___ deficiency

selenium

34

what is false about the mineral selenium

selenium is present only in foods of animal origin

35

what hormone requires selenium for its synthesis

thyroxine

36

where does the body store selenium

in amino acids in the body

37

diseases that cause the malbsorption of fat can result in a deficiency of ___

vitamin a

38

what mineral can function as an antioxidant

selenium