Question

why?
water accounts for over 70% of the human body. if water levels are not regulated and maintained in an organism the consequences can be disastrous. cells and tissues may swell, blood cells burst, or the brain may expand so much it pushes on the skull, leading to brain damage and death. so what exactly is the process that allows organisms to regulate and maintain their water content?
model 1 - movement of water in and out of cells

1. a solution consists of a solute and a solvent mixed together. for the solution in model 1 identify and provide the symbol for the:

a. solute:
b. solvent:

1. consider the size of the sugar and water molecules in model 1. which molecules in the diagram in model 1 are able to move through the selectively permeable membrane?

Explanation:

Step1: Identify solute and solvent in Model 1

According to the key in Model 1, sugar molecules are the solute and water molecules are the solvent. So for question 1:
a. solute: Sugar molecules (symbol: the circle symbol in the key)
b. solvent: Water molecules (symbol: the plus - symbol in the key)

Step2: Determine permeable molecules

Water molecules are small enough to pass through a selectively - permeable membrane, while sugar molecules are usually too large. So for question 2, water molecules are able to move through the selectively permeable membrane.

Answer:

1.
a. Sugar molecules (circle symbol)
b. Water molecules (plus symbol)

1. Water molecules