Lecture 2 Cell Membrane and Transport

Question 1

Review the phospholipid bilayer arrangement of cell membranes, its barrier function and selective permeability.

Answer 1

The phospholipids bilayer is a semi-permeable membrane that has polar heads and non-polar tails. The fluidity can change depending on what the integral proteins are doing

Depends on size for permabilty

Question 2

Understand and describe the mechanisms of transport across cell membranes.
Primary Active Transport

Answer 2

Na+ K+ ATPASE (Na K pump)
3 Na out and 2 K in
uses ATP

Question 3

Second Active Transport via Glut 1 Transport

Answer 3

ATP is not directly involved used Na+ gradient

Question 4

How to differentiate between if carrier mediated or simple diffusion

Answer 4

Carrier mediated will be faster

Question 5

Define the parameters that comprise the Fick’s Law of diffusion and how they affect diffusion

Answer 5

Q= Delta C x Area x Constant/ (Molecular Weight^1/2 x Area)

Question 6

Explain the mechanisms of carrier mediated transport and differentiate between types of transport

Answer 6

Carrier mediated is when another conc grad is used