Chapter 12 13 Nutrition

25 July 2022
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The distinction between the major and trace minerals reflect the?
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Amounts of their contents in the body.
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The principal cation in extracellular fluids is:
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Sodium.
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The role of chloride in the stomach is to help:
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Maintain a strong acidity.
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Which would provide the most potassium?
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Potatoes
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Calcium homeostasis depends on:
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Vitamin D, calcitonin, and parathyroid hormone.
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Calcium absorption is hindered by:
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Oxalates
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Phosphorus assists in many activities in the body, but not:
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The clotting of blood.
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Most of the body's magnesium can be found in the:
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Bones
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Which of the following is a characteristic of the trace minerals?
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The amounts in foods are dependent, in part, on soil composition
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A measure of the rate at which a nutrient is absorbed and used by the body is termed
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Bioavailability.
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What iron-containing compound carries oxygen in the bloodstream?
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Hemoglobin
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What is the oxygen-carrying protein of muscle cells?
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Myoglobin
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What is a protein that carries iron through the circulation to the tissues?
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Transferrin
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What does the term major mineral mean when describing the minerals in the body?
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Essential minerals the body needs in large amounts
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What does the term trace mineral mean when describing the minerals in the body?
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Essential minerals the body needs in small amounts
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What is the major function of sodium in the body?
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Maintains normal fluid and electrolyte balance, assists in nerve impulse transmission and muscle contractions
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How do the kidneys regulate blood sodium?
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They filter out sodium out of the blood and returns the amount of sodium needed back to the blood; they also excrete excess water and sodium after water consumption
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Is dietary deficiency of sodium likely?
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No, because diets rarely lack it and even when their intakes are low, the body adapts by reducing it's losses in urine and sweat
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What are calciums roles in the body?
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Bone structure and Calcium Bank
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How does the body keep blood calcium constant regardless of intake?
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The bones provide a nearly inexhaustible bank of calcium for the blood. The blood borrows and returns calcium as needed, so even with an inadequate diet, levels stay normal
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What are significant sources of calcium?
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Milk and milk products
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What are consequences of too little calcium?
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Early on it can cause a limited ability to peak with bone mass/density; also results in bone loss which can lead to osteoperosis
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What are consequences of too much calcium?
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It can lead to kidney stones
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What are the roles of phosphorus in the body?
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Assists in energy metabolism, part of the major buffer system, part of DNA and RNA therefore it is necessary for growth
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What is the relationship between calcium and phosphorus?
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85% of phosphorus in the body is combined with calcium in the hydroxyapatite crystals of bone and teeth
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Is dietary deficiency of phosphorus likely?
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No, it is rare because it is commonly found in almost all foods
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What are the major functions of Magnesium?
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Bone health, part of the protein making machine, helps with the immune system, and is necessary for energy metabolism
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What are the major functions of Chloride?
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Helps create gastric acid in the stomach to help break down protein, helps maintain fluid/electrolyte balance
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What are the major functions of Potassium?
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Helps maintain cell integrity and aids in muscle contractions and nerve impulse transmission
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What are the major functions of Sulfur?
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Part of proteins and helps stabilize their shape, part of biotin, thiamine, and the hormone insulin
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Which two major minerals help maintain fluid/electrolyte balance?
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Calcium and Chloride
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Which two major minerals aid in muscle contractions and nerve impulse transmission?
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Calcium and Potassium
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Which two major minerals assist in energy metabolism?
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Phosphorus and Magneisum
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What is the major function of hemosiderin?
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Releases iron more slowly than ferritin and is another storage protein
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What is the medical name for "Iron Overload"?
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Heredity hemochromatosis
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What is iron overload?
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A genetic failure that prevents unneeded iron in the diet from being absorbed
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What is Iron Deficiency?
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It refers to the depleted body iron stores without regard to the degree of depletion or to the presence of anemia
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What is Iron Deficiency Anemia?
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It refers to the severe depletion of iron stores that results in low hemoglobin concentration
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How does fluoride help with fighting dental caries?
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It replaces the hydroxyl in the hydroxyapatite to make fluorapatite which makes teeth stronger and protect from dental decay
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What it the trace mineral that participates in the metabolism of carbohydrates?
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Chromium
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What is Cretinism?
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A sever iodine deficiency during pregnancy that causes extreme and irreversible mental and physical retardation to the fetus
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Which trace mineral are pancreatic enzymes rich in?
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Zinc
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What is the important function of Selenium?
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Antioxidant nutrient: it fights against oxidation
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Where is manganese found in the body?
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Bone, Liver, Pancreas, Kidneys
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What is the primary function of manganese?
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It is a cofactor for enzymes that facilitate metabolism
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What do contaminent minerals do?
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Impairs the body's growth, work capacity, and general health
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Where are intracellular fluids found?
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Inside the cell: 2/3rds of the body's cellular fluids
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Where are extracellular fluids found?
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Outside the cell: 1/3rd of the body's cellular fluids
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What is the majority of body weight?
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Water
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What is hyponatrimia?
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A lack of sodium in the blood
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What percentage of fruits and vegetables is water?
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90%
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What percentage of meats and cheeses is water?
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50%
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On average, how much fluids are excreted through urine?
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2 cups
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On average, how much water should someone have in a day?
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64 oz.
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What are the kidneys central in the regulation of?
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Blood pressure and blood volume
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What is Renin?
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An enzyme released by kidney cells when blood pressure is low; it tells the kidneys to reabsorbs sodium
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What is angiotensinogen?
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A Protein in the Liver that is broken dow to Angiotensin 1. Angiotensin 1 is inactive until broken down to its active form Angiotensin 2.
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What is Angiotensin 2 and what does it do?
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A powerful vasoconstrictor that narrows the diameters of the blood vessels, thereby raising the blood pressure.
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What is ADH?
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Antidiuretic hormone that is released by the pituitary gland when blood volume or blood pressure is to low.
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What does ADH do?
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Stimulates the kidneys to reabsorb water.
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Too much sodium leads to what?
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More water retention and high blood pressure
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What is aldosterone?
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A hormone that is released by the adrenal glands because of angiotensin
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What does aldosterone do?
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Signals the kidneys to excrete potassium and to retain more sodium, therefore, more water
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Where sodium goes...
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Water follows
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What conducts electricity?
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Salt
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What are electrolytes?
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Salts dissociated into ions; they attract water
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What is osmosis?
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The movement of water across a membrane to the more concentrated solutes
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What is function of the Sodium-Potassium pump?
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Using ATP as an energy source, it actively exchanges sodium for potassium across the cell membrane
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What kind of compounds are minerals?
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In-organic
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Too much/too little amounts of minerals can what?
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Affect other minerals
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What are the key fluid balanced nutrients?
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Potassium, sodium, and chloride
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What is hypertension?
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High blood pressure
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Potassium is what?
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A principle intracellular cation
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High amounts of sodium is equal to what kind of amounts of potassium?
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Low
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Ways to reach toxicity of potassium?
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Overconsumption of potassium salts or supplements
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How much of the body's calcium is found in body fluids?
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1%
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About how much calcium ingested is absorbed in adults?
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30%
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What is calcium rigor?
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Too much calcium in the blood which results in muscle contraction without relaxation; too little Vitamin D or abnormal secretion of regulatory hormones
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What is calcium tetany?
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Too little calcium in the blood which results in uncontrollable muscle contraction; too little Vitamin D or abnormal secretion of regulatory hormones
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Osteoporosis has virtually no effect on what?
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Blood Calcium Levels
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What is the single most important factor in bone growth in adolescence?
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Physical Activity
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What is Cortical Bone?
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Hard outer shell of the bone and gives up calcium to the blood; loss begins to occur around age 40
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What is trabecular bone?
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Soft, spongy bone that gives up calcium when diet runs out; loss begins around age 30
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What is heme iron?
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Found in foods only derived from flesh, represents about 10% of iron consumed in a day, about 25% is absorbed in the body
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What is nonheme iron?
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Found in foods derived from plants and animals, about 17% is absorbed in the body
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What enhances the absorption of Iron?
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Vitamin C, Sugar (Fructose), and MFP(Meats, fish, poultry)
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What inhibits the absorption of iron?
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Phytates
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Who typically has less iron?
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Women and old people
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What is pica?
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Iron deficiency disease in which the person craves/consumes non food products such as chalk
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What does selenium help prevent?
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Free radical formation
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What does copper help make?
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Hemoglobin
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What is a source of manganese?
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Grain products
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What is fluorosis?
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A dental issue where too much fluoride is consumed and the issue is usually only during childhood development and is irreversible
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The body generates water during what?
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Oxidation of energy yielding nutrients through the electron transport chain.
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Principal cation in extracellular fluid is?
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Sodium
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Principal anion in extracellular fluid
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Chloride
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Principal cation in Intracellular fluid
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Potassium
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Principal anion in Intracellular fluid
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Hydrogen Phosphate