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Lecture 28

BSCI 10001 Lecture Notes - Lecture 28: Extracellular Fluid, Passive Transport, Fluid Compartments


Department
Biological Sciences
Course Code
BSCI 10001
Professor
Adam Arthur Leff
Lecture
28

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Cells and Tissues
Cellular Physiology: Membrane Transport
Membrane Transport movement of substance into and out of the cell
Transport is by two basic methods
Passive transport
No energy is required
Active transport
The cell must provide metabolic energy
Solutions and Transport
Solution homogeneous mixture of two or more components
Solvent dissolving medium
Solutes components in smaller quantities within a solution
Intracellular fluid nucleoplasm and cytosol
Interstitial fluid fluid on the exterior of the cell
Selective Permeability
The plasma membrane allows some materials to pass while excluding others
This permeability includes movement into and out of the cell
Passive Transport Processes
Diffusion
Particles tend to distribute themselves evenly within a solution
Movement is
from high
concentration
to low
concentration,
or down a
concentration
gradient
Passive Transport Processes
Types of diffusion
Simple diffusion
Unassisted process
Solutes are lipid-soluble materials or small enough to pass through
membrane pores
Passive Transport Processes
Types of diffusion
Osmosis simple diffusion of water
Highly polar water easily crosses the plasma membrane
Facilitated diffusion
Substances require a protein carrier for passive transport
Diffusion through the Plasma Membrane
Passive Transport Processes
Filtration
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