Diffusion & Osmosis

In order to produce a 0.9% NaCl solution or physiological saline, you had to add __________ of H2O to 0.9g of NaCl.

99.1 mL

T or F ? A gated channel protein is always open to allow molecules to pass through as part of the process of facilitated diffusion.

False

T or F ? Diffusion is specifically defined as the movement of particles in a solution along their respective concentration gradients.

False

___ transport processes do not require the use of ATP while ___ transport processes do.

Passive; Active

The rate of diffusion is affected by which of the following?

Temperature, size of molecules, and steepness of the concentration gradient

T or F ? A 5% urea solution is hypotonic to a 10% urea solution.

True

T or F ? Diffusion is one of the processes whereby materials are exchanged between a cell and its environment.

True

A red blood cell placed in a hypertonic medium will _____.

shrink

When the cell is placed in a hypotonic solution

the cell swells

When sugar is mixed with water, equilibrium is reached when _____.

the dissolved sugar molecules are evenly distributed throughout the solution

Osmosis is defined as the diffusion of __________ across a semi-permeable cell membrane.

water

Osmosis is best defined as the movement of _____.

water molecules across a membrane from an area of high water concentration to an area of lower concentration

When osmolarity is increased to 1.5% NaCl the molecules move to the __________ side of the cell membrane.

interstitial fluid

Simple diffusion is defined as the movement of _____.

molecules from areas of higher concentration to areas of lower concentration