HB PowerPoint 3 Flashcards
What is passive transport?
Passive transport does not require energy. Passive transport is where substances move with the concentration gradient.
What is Active Transport?
Active transport does require energy and substances move against the concentration gradient.
What is Simple Diffusion (Passive transport)?
Def: The spreading of particles from area of ⬆️ concentration to areas of ⬇️ concentration, result in even distrib of particles.
How does simple diffusion spread out particles.
This spreading out of particles brought about due to more collisions happening btwn particles @ hi concentration. Force them to move away from each other to area of low concen w/ less collisions.
What is the concentration gradient?
The concentration gradient is the difference in concentration that brings about diffusion. The greater the difference btwn 2 concentrations, faster rate of diffusion.
What is facilitated diffusion (passive transport)?
def: Spreading out of particles from area of ⬆️ concen to areas of ⬇️ concen, resulting in even distrib of particles, occuring thru channel protein.
It is generally used for water molecules and ions as they are polar molecules
What is osmosis (passive transport)?
Def: Diffusion of a sovent (water) through differentially (semi) permeable membrane. Solvent can move thru membrane, while solid (solute) cant fit. As solid cant fit, only way for equilibrium of concentration is movement of solvent.
What is tonicity?
The concentration of a solution as compared to another solution
What is isotonic?
Extracellular and intracellular ionic concentrations equal.
What is hypotonic?
Extracellular ionic concentration is less than intracellular.
What is hypertonic?
Extracellular ionic concentration is more than intracellular.
What is the definition of Active Transport?
Def: The spreading out of particles from area of ⬇️ concen to area of ⬆️ concen, result in even distrib of particles. Occur predominantly thru carrier protein, require nrg.
What is Endocytosis (active transport [vesicular])?
Def: Taking in of solids/liquids thru vesicles.
Steps:
1. Cell membrane fold around substance (solid or liquid) until completely enclosed.
2. Vesicle then pinches off within the cytoplasm.
What is Pinocytosis
Taking in of liquids (cell drinking)
What is phagocytosis
Taking in solid particles (cell eating)
