https://youtu.be/Ptmlvtei8hw Cellular Transport https://youtu.be/Ptmlvtei8hw

Cell Transport Video Notes List the 4 common parts of cell between Prokaryotes and Eukaryotes. True or False: Cells with Organelles are Prokaryotes. TRUE FALSE Explain Homeostasis in your own words.  What is the function of the cell membrane (AKA plasma membrane)? The Cell membrane is made of a _____________________________ bilayer. Label the diagram:

Cell Transport Video Notes True or False: No energy is used in simple diffusion. TRUE FALSE Diffusion is the movement of molecules from a______________________ concentration to a ____________ concentration. True or False: Passive Transport does not require energy. TRUE FALSE True or False: Active Transport needs energy in the form of ATP. TRUE FALSE What are TWO examples of active transport?

Plasma Membrane Selective Permeability Phospholipid bilayer Hydrophilic head and hydrophobic tail Protein channel

Plasma Membrane is selectively permeable Selective permeability is essential to cells. Why? Obtain nutrients Eliminate wastes Maintain stable interior environment (Homeostasis)

Homeostasis Homeostasis is the tendency to resist change in order to maintain a stable, relatively constant internal environment. Example: Body maintains Homeostasis on temperature. How is it maintained? Disruptions to the feedback loop disrupts Homeostasis.

Passive Transport Passive Transport is movement of molecules across semi permeable membrane from High concentration to low concentration WITHOUT use of energy/ ATP Types pf Passive Transport Diffusion Osmosis

Diffusion (spread out) Diffusion is net movement of molecules from region of high concentration to region of low concentration till equilibrium is reached. Solvent Solute Solution It does not need energy/ ATP – Passive Transport Example: Diffusion of Perfume molecules

Osmosis Osmosis is the spontaneous diffusion of solvent molecules through semi-permeable membrane into a region of higher solute concentration. It will equalize solute concentrations on both sides.

Tonicity Tonicity is concentration of solutes dissolved in solution. It is 3 types: Hypotonic- There is net inflow of water— the cell gains water through osmosis. Cell will swell and may burst open, filling a balloon. Isotonic- There is no net inflow of water across cell membrane. Cell remains same size. Hypertonic solution- There is net outflow of water — the cell loses water by osmosis. Cell will lose pressure and shrivel, RBC’s or plant cell.

Active Transport Active Transport is movement of molecules across semi permeable membrane from Low concentration to high concentration using energy/ ATP. Example: Sodium(Na+) Potassium pump(K+)

Types of Active Transport Endocytosis is process of capturing substance from outside the cell by engulfing it with the cell membrane, and bringing it into the cell.  Exocytosis describes process of vesicles fusing with plasma membrane and releasing their contents to outside the cell.