Cell Membrane Permeability

Question 1

Bears the primary responsibility of determining what materials come in and out of the cell and at what rate

Answer 1

Cell membrane

Question 2

The Human RBC has an osmotic content that is equivalent to about ____% NaCl

Answer 2

0.9

Question 3

In dilute or hypotonic medium, the cells ____ due to the influx of water

Answer 3

Swell

Question 4

The cell’s contents including the red-colored protein, hemoglobin, are released into the surrounding medium and there is a change in appearance from opaque red cell suspension to clear pink solution

Answer 4

Hemolysis

Question 5

Isotonic coefficient of sucrose

Answer 5

1

Question 6

Degree of dissociation for sucrose

Answer 6

0

Question 7

Another name for cell membrane

Answer 7

Plasma membrane

Question 8

What are the factors that influence cell permeability

Answer 8

1. Temperature
   Higher temperature makes the membranes less stable and more fluid.
   Lower temperature slow its function.
   Excessive heat can lead to a complete loss of membrane structure.
   Increased temperature prompts phospholipids to become more mobile due to heightened energy, thus enhancing membrane permeability.
2. Solute composition
   Large molecules are unable to pass, some require protein channels
   Smaller molecules diffuse through.
3. Cell hydration
   Lower hydration levels diminish the membrane’s capacity to permit molecule passage, correlating with reduced permeability