NTR 109 WATER_MINERALS OUTLINE (LECTURE 6)

NTR 109 WATER_MINERALS OUTLINE (LECTURE 6) - Lecture 6...

Info iconThis preview shows pages 1–5. Sign up to view the full content.

View Full Document Right Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
This is the end of the preview. Sign up to access the rest of the document.

Unformatted text preview: Lecture 6 Water & Minerals Water 0. 50% - 70% of body weight 1. Muscle contains 73 % water 0. Fat contains ~20 % water 2. Intracellular fluid 1. Fluid inside the cells - 2/3 of all body fluids 3. Extracellular fluid 2. Fluid outside the cells- 1/3 of all body fluids Fluid Balance 0. Water shifts freely in and out of cells permeable to water 1. Controlled by electrolyte concentration : able to conduct an electrical current :mineral that has an electrical charge +, - 2. Osmosis passage of water through semi permeable membrane from area of high water potential ( outside of the cell) to an area of low water potential 3. Intracellular water volume 0. Depends on intracellular potassium and phosphate concentrations 4. Extracellular water volume 1. Depends on extracellular Sodium and Chloride concentrations Functions of Water Water requires a lot of energy to change the state 1L -> 600 kcal 5. Body Temperature regulation 2. Water absorbs excess: heat 3. Body secretes fluid via perspiration(sweat) 4. Skin is cooled as perspiration evaporates 6. Removal of body waste via urine 5. Urea excretion ( Urea: major boy waste product ->product of protein metabolism) 6. Sodium excretion 7. Avoid concentrated urine 7. Amniotic(fluid that surrounds fetus, shock absorber) fluid, joint lubricants, saliva, bile Are You Drinking Enough? Ion institute of medicine 0. Recommended as a starting point: * 9 cups for women * 13 cups for men 4-12 cups of fluids for replace daily water losses Thirst Mechanism 0. Not reliable 1. Concerns for infants, older adults, athletes 2. Athletes 0. Weigh before and after training session 1. Consume 3 cups for every pound lost 3. Illness (vomiting, illness, fever) Ignoring the Thirst Signal 8. Shortage of water increases: fluid conservation 9. Antidiuretic hormone 8. Released by the pituitary gland 9. Forces kidneys to conserve water (reduce urine flow) 10. Aldosterone 10. Responds to drop in blood pressure 11. Signals the kidney to retain sodium (water) ( water always follows sodium) Hydration 11. Loss of 1%-2% of body weight in fluid 12. Thirst Signal 12. Loss of 2% or more of body weight causes muscle weakness 13. Lose significant strength & Endurance 13. Loss of 10%-12% 14. Heat intolerance, body weakness, sluggishness, problems with balance 14. Loss of 20% 15. Coma, Death Too Much Water 4. Overburden the kidneys 5. Low: Blood electrolyte concentrations -> low sodium in blood hyponatremia 6. Blurred vision Minerals 7. Various functions in the body 8. Major Minerals : vital to your health 2. Require >100 mg /day : 1/30 of teaspoon...
View Full Document

This note was uploaded on 03/22/2011 for the course NTR 101 taught by Professor Chabot during the Spring '11 term at Buffalo State.

Page1 / 14

NTR 109 WATER_MINERALS OUTLINE (LECTURE 6) - Lecture 6...

This preview shows document pages 1 - 5. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online