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Preventative Med. & Nutrition > Exam #1: Minerals II > Flashcards

Exam #1: Minerals II Flashcards

(71 cards)

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1
Q

Where is the majority of the body’s iron found?

A

Hemoglobin

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2
Q

What is the point of regulation for iron?

A

Absorption

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3
Q

What are the two types of iron? Where do the different types of iron come from?

A

Heme= animals ONLY

Nonheme= BOTH plant and animal sources

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4
Q

Which form of iron is more readily absorbed?

A

Heme

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5
Q

What can increase the absorption of non-heme iron?

A
  • Acids e.g. Vitamin C

- Sugars

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6
Q

What are the major functions of iron?

A

1) Center of heme/ O2 transport

2) Enzyme component

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7
Q

What is the relationship between Vitamin C & Iron?

A

Vitamin C enhances absorption of non-heme iron

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8
Q

What is the relationship between Copper & Iron?

A

Copper - ceruloplasmin- mobilizes iron from stores in the liver

*****Note that without copper/ ceruloplasmin, iron essentially gets “stuck” in the liver and can cause liver damage

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9
Q

What is the relationship between Zinc & Iron?

A
  • Iron decreases the absorption of zinc

**Note that zinc competes for the same portion of the absorptive pathway as iron; thus, high zinc will decrease iron (especially non-heme) absorption

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10
Q

What is the relationship between Vitamin A & Iron?

A

Vitamin A deficiency reduces the distribution of iron to tissue

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11
Q

What is the relationship between Lead & Iron?

A

Lead inhibits the enzyme necessary for heme synthesis AND the enzyme necessary for iron incorporation into heme

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12
Q

What are the four groups that are most susceptible to iron deficiency in the US?

A

1) Infants and young children
2) Adolescents
3) Premenopausal women
4) Pregnant women

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13
Q

What are the symptoms of iron deficiency?

A
  • Pallor
  • Dizziness
  • Palpitations
  • Pica
  • Fatigue
  • Dyspnea
  • Angular stomatosis
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14
Q

What are the lab findings commonly seen in iron deficiency?

A
  • Decreased Hb
  • Microcytic anemia
  • Decreased serum iron
  • Increase TIBC
  • Decreased serum ferritin

**Note that iron deficiency can occur without anemia

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15
Q

What are the symptoms of iron toxicity?

A
  • Vomiting
  • Diarrhea
  • Tissue damage (liver & brain)
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16
Q

What is the most typical acute cause of iron toxicity?

A

Overdose

**Think gummie vitamins

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17
Q

What are the chronic causes of iron toxicity

A
  • Hemolytic anemia
  • Hemochromatosis
  • Idiopathic hereditary hemochromatosis
  • Iron-loading anemias i.e. thalassemia & sideroblastic anemia
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18
Q

What is the treatment for iron toxicity?

A

Phlebotomy & chelation

*****Chelation= drug that binds iron so that it can be more readily excreted, best for chronic toxicity

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19
Q

What are the major functions of zinc?

A
  • Enzyme cofactor
  • Functions in tissue/ cell growth & replication, skin integrity, bone formation, and wound healing
  • Immunosuppression
  • Carbohydrate metabolism (incorporation into insulin)
  • Taste
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20
Q

What are the major nutrients, macorminerals, and microminerals essential to wound healing?

A
  • Protein
  • Vitamin C
  • Zinc
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21
Q

What is the relationship between zinc & Vitamin A?

A

Zinc deficiency is associated with decreased mobilization of retinol (Vitamin A) from liver

*****Zinc is necessary for hepatic synthesis of retinol binding protein

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22
Q

What is the relationship between zinc & copper?

A

Excessive zinc intake decreases copper absorption

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23
Q

What is the relationship between zinc & Ca++?

A

Zinc supplements decrease Ca++ absorption

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24
Q

What is the relationship between zinc & folate?

A
  • Folate digestion requires zinc

- Deficiency in zinc could lead to folate deficiency

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25
What is the relationship between zinc & cadmium?
Cadmium is a competitive zinc antagonist
26
What is the relationship between zinc & lead?
- Lead may replace zinc in enzyme for heme synthesis | - Toxic levels of lead thus inhibit heme synthesis
27
What are the symptoms of zinc deficiency?
1) Delayed wound healing 2) Hypogonadism 3) Alopecia 4) Dysguesia 5) Anosmia 6) Nonspecific peri-oral rash
28
What are the symptoms of zinc toxicity?
- Metallic taste - Nausea - Vomiting - Diarrhea - Copper deficiency leading to iron deficiency *****Remember, HIGH zinc= LOW Copper-->LOW Iron
29
What are the functions of copper?
The major functions of copper include: - Enzyme cofactor - Electron donor/ acceptor - Gene expression by binding to transcription factors
30
What are the enzymes that utilize copper as a cofactor?
1) Ceruloplasmin 2) Cytochrome C 3) Superoxide dismutase 4) Tyrosinase
31
What is the relationship between copper and zinc?
- Toxic levels of zinc inhibits copper absorption - Copper is an essential component of the enzyme ceruoplasmin - Ceruloplasmin mobilizes iron from stores in the liver ****Thus, HIGH ZINC = LOW COPPER and LOW IRON
32
What is the relationship between copper and molybdenum?
Molybdenum causes copper excretion
33
What is the relationship between copper and selenium?
Copper deficiency decreases selenium-dependent enzyme function
34
What are the symptoms of copper deficiency?
- Hypochromic anemia - Neutropenia - Hypopigmentation - Imparied immune function - Demineralization of bone
35
What is Wilson's Disease?
- Disease characterized by defect in transporter required for biliary excretion of copper - Leads to accumulation of copper in liver, brain, & kidneys - Causes mental retardation & liver damage
36
What is Menke's Syndrome?
- Disease characterized by defect in transported required for copper into fetus - Causes slow growth, mental degradation, and kinky white hair
37
What are the symptoms of copper toxicity?
- Nausea - Vomiting - Diarrhea - Hematuria - Jaundice ****Note that this is v. rare and occurs via water contamination or accidental ingestion
38
What are the functions of Selenium?
- Maintenance and induction of cytochrome p450* - Cofactor for glutathione peroxidase - Iodine metabolism; no selenium can lead to iodine deficiency
39
What is the relationship between selenium and lead?
Lead cause a decrease in tissue concentrations of selenium
40
What is the relationship between selenium and iron?
Iron deficiency decreases synthesis of glutathione peroxidase & selenium concentrations
41
What is the relationship between selenium and copper?
Copper deficiency decreases activity of selenium-dependent enzymes
42
What is the relationship between selenium and methionine?
Methionine deficiency causes decreased selenium potency
43
What is Keshan Disease?
Regional selenium deficiency seen in China that is characterized by: - Cardiomyopathy w/ cardiogenic shock - CHF - Necrosis of the heart *****Note that this disease also requires exposure to COXSACKIE virus
44
What is Kashin-Beck's Disease?
Regional selenium deficiency seen in China that is characterized by: - Osteoarthropathy - Degeneration & necrosis of joints
45
What are the symptoms of Selenosis?
- Nausea - Vomiting - Fatigue - Hair & nail loss - Inhibition of protein synthesis *****Note that this can be seen in miners, and those with an excessive intake
46
What are the functions of iodine?
1) Iodine is required for the synthesis of thyroid hormones | 2) Controls basal metabolic rate, growth, development, protein synthesis, and energy metabolism
47
What are the symptoms of iodine deficiency?
Hypothyroidism w/ - Goiter - Decreased cold tolerance - Overweight - Coarse hair
48
What are the symptoms of iodine toxicity?
Hyperthyroidism - Weight loss - Exopthalmous - Heat intolerance - Goiter
49
What is the major function of fluoride?
Mineralization of teeth and bones
50
What nutrients reduce uptake of flouride?
Aluminum Ca++ Mg++ Cl-
51
What nutrients increase flouride uptake?
Phosphate | Sulfate
52
What are the symptoms of flouride deficiency?
- Dental carries | - Decreased integrity of skeletal tissue
53
What are the symptoms of fluorosis?
- Mottling of teeth | - Changes in bone, kidney, & nerve/muscle function
54
What are the functions of chromium?
- Binds nicotinic acid & amino acids to form glucose intolerance factor - Glucose intolerance factor initiates disulfide bridging between insulin and the insulin receptor; thus, the effectiveness of insulin is INCREASED with chromium - Glucose & lipid metabolism
55
What are the symptoms of chromium deficiency?
- Glucose intolerance - Insulin resistance - Hyperinsulinemia
56
What are the symptoms of chromium toxicity?
- Respiratory distress - Dermatitis - Ulercation *****Note that this comes from inhalation or direct skin contact
57
What are the functions of manganese?
- Enzyme activator & constituent of metalloenzymes | - Modulator of second messenger pathways
58
What are the symptoms of manganese deficiency?
``` Nausea Vomiting Dermatitis Decreased growth of hair & nails Low blood cholesterol ``` *****This is very rare and typically only seen if intentionally eliminated from the diet
59
What are the symptoms of manganese toxicity?
- Liver failure | - Parkinson-like sx
60
hare the functions of molybdenum?
Component of enzymes involved in redox reactions
61
What are the symptoms of molybdenum deficiency?
- High blood methionine - Low blood xanthine - Low blood uric acid *****Associated with esophageal cancer & long-term TPN admin.
62
What are the symptoms of molybdenum toxicity?`
Gout due to high uric acid concentrations
63
List the ultra-trace elements.
``` Nickel Silicon Vanadium Arsenic Boron Cobalt Tin Lithium ```
64
What is the most likely source of aluminum toxicity?
Food additives and antacids
65
What are the symptoms of aluminum toxicity?
- Renal encephalopathy | - Neurotoxicity
66
What is the source of cadmium toxicity?
Pollution
67
What are the symptoms of cadmium toxicity?
- Osteomalacia by antagonizing Ca++ metabolism | - Anemia by antagonizing zinc & iron
68
What is the source of mercury toxicity?
Pollution (run off that accumulates in fish)
69
What are the symptoms of mercury toxicity?
- Ataxia - Visual problems - Mental retardation - Neuromuscular problems in infants
70
What is the source of lead toxicity?
Lead paint in older buildings & pottery
71
What are the symptoms of lead toxicity?
Neurological, kidney & hematological damage

Preventative Med. & Nutrition (30 decks)

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