Nutrition Chapter 14 - Water

Question 1

What percent of the body is water?

Answer 1

50-70%

lean tissue contains much more water than fat tissue

Question 2

Where is water found in the body?

Answer 2

intracellular - in the cells

extracellular - outside the cells (interstitial and intravascular)

Question 3

What functions does water have in the body?

Answer 3

lubricant, solvent, regulates body temperature, helps remove waste, transports nutrients, metabolic processes, component of body fluids

Question 4

How does water help regulate body temperature?

Answer 4

sweat ad evaporation

absorbs excess heat - high specific heat

Question 5

What is water balance?

Answer 5

water in = water out
water out - lungs, feces, urine, sweat
water in - liquids, foods

Question 6

What is the recommendation for water intake?

Answer 6

varies between individuals by age, gender, pa, climate, diet
men - 3.7L
women - 2.7L

Question 7

What factors effect thirst?

Answer 7

alcohol, caffeine, medications, illness, lifestyle, environment

Question 8

How does the thirst mechanism work?

Answer 8

brain receives signals of increased blood osmolality
pituitary gland releases ADH
kidneys decrease blood pressure
angiotensinogen released from liver –> angiotensin I –> angiotensin II –> signals blood vessels to constrict and sodium retention

Question 9

What is water intoxication?

Answer 9

Intake of too much water w/o electrolytes

kidneys can’t handle all the water