Module 3.2 :Membrane Transport
- One of the most important characteristics that allow cells to be extremely efficient is their ability to move substances across their membranes. In this module we will examine the different methods that allow cells to move materials across membrane using simple processes like diffusion or energy expensive processes like ion-pumps.
Module 3.2 Warm-Up : Neurotoxins
- Directions: in this warm-up, you will explore the functionality of neurotoxins, specifically how most affect a neurons ability to transmit neurotransmitters across their membrane.
- Pick one of the types of neurotransmitters from the photo below and research the following:
1) How does this neurotoxin effect the cell's ability to move substances across the membrane?
2) What type of membrane transport is inhibited?
3) Draw a quick sketch that shows the toxins ability to inhibit transport of neurotransmitters.
Essential Vocab:
membrane
junctions, tight junctions, desmosomes, gap junctions, interstitial fluid,
selective permeability, passive processes, active processes, diffusion,
concentration gradient, simple diffusion, osmosis, facilitated diffusion,
carriers, channels, aquaporins, hydrostatic pressure, osmotic pressure,
tonicity, isotonic, hypertonic, hypotonic, active transport, symport system,
anitport system, sodium-potassium pump, vesicular transport, exocytosis,
endocytosis, phagocytosis, clathrin, phagosome, membrane potential, resting
membrane potential, polarized, electrochemical gradient, membrane receptors
Module Objectives:
2.1 – Describe the chemical composition of the plasma membrane and relate it back to its functions.
2.2 – Describe the physiology of the following: selective permeability, diffusion (simple, facilitated, osmosis), active transport, passive transport, solute pumping, exocytosis, endocytosis, phagocytosis, bulk phase endocytosis, hypertonic, hypotonic, and isotonic.