Cell adhesion, cell junctions, and transport

What is the basic principles of cell transport

it is how substances move through, in and out of cell membrane through passive transport, osmosis and active transport

What is selectively permeable characteristics

allowing some substances to pass through lipid bilayer while blocking other substances

What is passive transport

does not require metabolic energy (ATP)

diffusion of random movement toward equilibrium

What factors affect speed of diffusion

Diameter of molecules (smaller size=faster diffusion)

Temperature of solution (higher temperature= faster diffusion)

Concentration gradient in the system (greater concentration gradient in system= faster substance will diffuse)

What is simple diffusion

process in which molecules/atoms/ions diffuse through semipermeable membrane down their concentration gradient with NO assistance of transporter proteins

What type of molecule can pass through the membrane in simple diffusion

molecule that is hydrophobic

soluble in lipids

When will simple diffusion stop

when equilibrium is met

What is facilitated diffusion

passive transport of molecules across a cell membrane where channel/carrier proteins assist movement of molecules from region of high concentration to low concentration

no ATP

What is the basic principles of cell adhesion

What is/are cell adhesion molecules

What is the basic principles of cell junctions

What are adherens junctions 

What are desmosome junctions

what are tight junctions

what are gap junctions