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AU - NTRI 2000 - Nutrition Class Notes 4/10/2018 - Class Notes

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AU - NTRI 2000 - Nutrition Class Notes 4/10/2018 - Class Notes

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background image Class Notes 4/10/2018 Functions of water o Distribution of nutrients
o Removal of waste products
o Temperature regulation
Water absorbs excess heat Body secretes fluid via perspiration Skin is cooled as perspiration evaporates   o Lubrication  Saliva, mucus, cerebrospinal fluid  o Cushioning 
o Medium for/participant in chemical rxns 
o Acid-base balance 
o Nutrient & Waste transport
Water transports nutrients through the blood 
and nymph, excretes wastes through the 
formation of urine 
Water Intake vs Output o Intake – water you take in
o Output – water you excrete 
Urinary excretion primarily  Perspiration Respiration Feces  o Altitude, caffeine, alcohol, humidity, physical activity  All influence water loss Fluid adequate Intake: 9 cups for women 
and 13 cups for men
Total Adequate Intake: 11 cups for 
women and 15 cups for men 
Fluid Conservation o Thirst is the first sign of dehydration Shortage of water increases fluid conservation o Kidneys, Blood Vessels, brain all monitor blood  pressure & solute concentration in blood  o Antidiuretic Hormone (ADH), Angiotensin,  Aldosterone  ADH – hormone secreted by pituitary gland 
when blood solutes are high; causes kidneys to
decrease water excretion 
Angiotensin – hormone activated by enzymes 
in kidneys; signals adrenal glands to produce 
aldosterone; directs kidneys to conserve 
sodium
background image Aldosterone – hormone produced by adrenal 
glands; acts on kidneys to conserve sodium
Hydration o Loss of 1-2% of body weight in fluid Triggers thirst signal  o Loss of 2%+ Muscle weakness o Loss of 10-12% Heat intolerance  o Loss of 20% Coma and death  To much water o Low blood electrolyte concentrations (low sodium in  blood) Hyponatremia (water intoxication) Minerals o Individual chemical elements that cannot be broken  down further o Categorized based on amount we need 
o Major minerals
Require >100 mg/day Ca, P, Mg, S, Na, K, Cl Sodium o Table salt (NaCl): 40% sodium, 60% Chloride o Positive extracellular ion
o 95% of ingested sodium is 
absorbed  o No further digestion required 
o Functions:
Fluid balance Nerve impulse conduction Muscle contraction Absorption of nutrients 
(glucose)
o Fluid balance Kidneys filter sodium Low blood sodium 
sodium filtered by 
kidneys secreted back 
into blood

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School: Auburn University
Department: Nutrition and Food Sciences
Course: Nutrition and Health
Professor: Ramesh Jeganathan
Term: Summer 2015
Tags:
Name: Nutrition Class Notes 4/10/2018
Description: These notes cover the in class discussion on 4/10/2018
Uploaded: 04/11/2018
4 Pages 19 Views 15 Unlocks
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