Lecture notes Contexts of Care (SHN169)

SHN169 - Osmosis and Diffusion


Osmosis and Diffusion

Outline
 Cell structure
o Cytoplasm.
o Plasma membrane .
 Overview of transport processes.
o Osmosis.
 Dehydration.
 Water intoxication.
o Simple diffusion.
 Dialysis.
o Facilitated diffusion.
 Channel-mediated passive transport.
 Carrier-mediated passive transport

Levels of Organisation
 From smallest to largest  these come together to form the next structure




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, SHN169 - Osmosis and Diffusion


Eukaryotic Animal Cell




 Cell Membrane
o Plasma membrane – separates and protects the cell from the outside
environment.
o Semi permeable
 Nucleus – contains the genetic information
 Nucleolus – found within the nucleus
 Ribosomes – responsible for synthesising proteins
 Mitochondrion – processing of energy
 Lysosome – recycling centre for the cell
 Cytoplasm – semi-fluid which fills the cell where majority of cellular process
take place
 Rough endoplasmic reticulum – synthesis of proteins
 Smooth endoplasmic reticulum – synthesis of lipids and steroids
 Golgi – packages proteins into Golgi vesicle
o To allow for the transportation to where they are required
 Microtubules – involved in process of mitosis (cell division) and also
maintaining the shape of the cell
 Centrosome and Centrioles – also involved in the process of cell division

Intra- and Extra-cellular fluid
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