Class notes
Plasma membrane and cell transport
- Course
- BIO 181 (BIO181)
- Institution
- Arizona State University - Tempe
unit 2 lecture 2 of BIO 181, goes over how cells transport things, stages of mitosis
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Plasma membrane and celltransport
Cell membranes
the intelligence security system of life
Highly selective
Asses and adapts to its enviorment
controls what enters & exits
Maintains homeostasis
selectively permiable
chanells
phosphate head
bilayer
Cell structure
Phospholipids:creates bi layer
CHolesterol: stabalizes animal cell protein
Proteins – regulate what enters and exist the cells, play a role in cell
communication, immune response, etc
Glycoproteins: A protein with a carbohydrate attatched (cell to cell
comunication)
Glycolipids: lipids with carbs attatched (increase stability, used by virus &
pathogens to enter cell)
Movement within cell
Diffusion:There is net movement of solute from the area of higher solute
concentration to the area of lower solute concentration, to create same in both
Plasma membrane and cell transport 1
, Passive process (doesnt require energy)
Influenced by tempature, density etc
Small polar or non polar molecules move through easily, the higher the
change or size makes it harder
Simple diffusion – net movement of solutes across the cell membrane from
an area of higher concentration to an area of lower concentration without
the assistance of channels (proteins)
Facilitated diffusion – net movement of solutes across the cell membrane
from an area of higher concentration to an area of lower concentration
with the assistance of channels (proteins)
Osmosis - net movement of water from and area of higher concentration
of water to an area of lower concentration of water (like oasis- water)
Passive process
Osmotic Gradient - Difference in concentration of water on once side
of the membrane relative to the other
Tonicity: Measure or description of the osmotic gradient
Isotonic: Solute has the same concentration as another, no net
movement
Hypertonic solution: Solution has a higher concentration than
another, water moves out of the cell
Hypotonic: solution has lower concentration than another, water
moves into cell
Protein channels (for ions)
Gated channels
Voltage gated: open based off of change within or outside of cell
Leak: always open
Active tranport
Transport of ions (through pumps) that requires energy (atp)
Plasma membrane and cell transport 2
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