4.3 Water Flashcards
How long can we survive without food? Without water?
8 weeks; few days
What percentage of the body is made up by water?
50-70%
What has a higher water content, lean muscle or adipose tissue?
lean muscle
What isthe importance of water?
important for many chemical and metabolic reactions and functions as a solvent
What is a solvent?
substance that can dissolve other substances
What is a solute?
substance that is dissolved
What are electrolytes?
ions and minerals that have an electrical charge
What are the water soluble ions in our body?
sodium
potassium
chloride
phosphate
magnesium
calcium
What dictates how water moves in the body?
concentrations of ions inside and outside of cells
What is osmosis?
movement of water through a semipermeable membrane from a less concenrated solute area to a higher concentrated solute area
What does intracellular water volume depend on?
potassium and phosphate concentrations
What does extracellular water volume depend on?
sodium and chloride concentrations
What are the main functions of water?
controlling blood volume
regulating body temperature
removal of waste products
lubrication
making saliva, bile, and amniotic fluid
What is perspiration?
sweating; fluid is released through the skin pores and evaporates regulating body temperature
What is the bodys mechanism to prevent overheating?
sweating
