Lec8 - Membrane Transport I

Lec8 - Membrane Transport I - Lecture 8: Movement of...

Info iconThis preview shows pages 1–13. Sign up to view the full content.

View Full Document Right Arrow Icon
Lecture 8: Movement of Molecules Across Cell Membranes (I) Reading: Chapter 2; pp 64 – 67, 27- 30 Lecture Outline I. Simple Diffusion II. Osmosis (Facilitated Diffusion of Water)
Background image of page 1

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
An Overview of Transport Across membrane
Background image of page 2
Structure of Plasma Membrane
Background image of page 3

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Plasma membrane: 1. Links adjacent cells together by membrane junctions (desmosomes, tight junctions and gap junctions). 1. Helps maintain composition of intra- and extracellular fluids. Regulates traffic in and out of cell. 1. Detects chemical messengers arriving at cell surface. 1. Forms a framework for protein components of cell.
Background image of page 4
Intercellular junctions in animal tissues
Background image of page 5

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
Gap Junctions Specialized protein complexes that create an aqueous pore between two adjacent cells Hydrophilic chemical messengers can travel through the lipid membrane Typically involves the movement of ions
Background image of page 6
How do cells accomplish selective transport of molecules across the plasma membrane? Two basic mechanisms: I. Simple Diffusion II. Facilitated or Mediated Transport 1. Facilitated diffusion 2. Active transport 3. Endocytosis and exocytosis
Background image of page 7

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
How do cells accomplish selective transport of molecules across the plasma membrane? Figure 2.48 X
Background image of page 8
Background image of page 9

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
I. Simple Diffusion
Background image of page 10
diffusion Diffusion: A random walk process - due to random thermal motion .
Background image of page 11

Info iconThis preview has intentionally blurred sections. Sign up to view the full version.

View Full DocumentRight Arrow Icon
FLUX is a measure of the rate of diffusion. Molecular movement is not unidirectional, although the one-
Background image of page 12
Image of page 13
This is the end of the preview. Sign up to access the rest of the document.

This note was uploaded on 09/12/2010 for the course BIOLOGY 225 taught by Professor Pavgi during the Winter '10 term at University of Michigan.

Page1 / 30

Lec8 - Membrane Transport I - Lecture 8: Movement of...

This preview shows document pages 1 - 13. Sign up to view the full document.

View Full Document Right Arrow Icon
Ask a homework question - tutors are online