Exam 6: Interactions Between Cells and the Extracellular Environment

Ion channels that can be opened by physiological stimuli are said to be

The rate of diffusion increases as the concentration gradient increases.

Glucose entry into the cell is by facilitated diffusion.

The process in which waste molecules are removed from the blood by having them diffuse through an artificial porous membrane is called dialysis.

How much of the total body water content is in the intracellular compartment?

Freezing-point depression is a measure of osmolality.

____________________ is a term which describes a membrane that allows only certain molecules to penetrate it.

The amount of water in a cell placed in a 0.8 Osm solution would

If the intracellular concentration of Ca²⁺ was 10mEq/L and the extracellular concentration was 150mEq/L,the Ca²⁺ equilibrium potential would be

Antidiuretic hormone is released by the posterior pituitary in response to increased plasma osmolality.

Where is the G-protein complex when a regulatory molecule is not bound to its receptor?

Individuals suffering from cystic fibrosis have defective ____________ ion channels.

Transport of materials through an epithelial cell is called

Because the kidneys are so important for water balance,the plasma membranes of kidney cells have many permanent aquaporins.

The majority of water within the body is found in the

Which G-protein subunit binds GDP?

Epithelial cells have a polarity dealing with transport.

A solution with an osmolality four times greater than plasma would freeze at __________.

Which of the following is NOT a function of integrins?

The osmotic pressure of a solution is directly related to its ___________ concentration.