Membranes & Transport Flashcards
(8 cards)
What is passive transport?
Passive transport does not require energy and moves solutes down their concentration or electrochemical gradient.
What are the two main types of passive transport?
Simple diffusion (directly through the membrane) and facilitated diffusion (via membrane proteins like channels or carriers).
What is active transport?
Active transport requires energy (usually ATP) and moves solutes against their concentration gradient using membrane proteins.
What is the difference between primary and secondary active transport?
Primary active transport uses ATP directly; secondary active transport uses energy stored in an ion gradient.
What is vesicular transport?
The movement of large or bulk substances across the membrane using vesicles.
What are the types of endocytosis?
Phagocytosis (“cell eating”), pinocytosis (“cell drinking”), and receptor-mediated endocytosis (selective uptake).
What is exocytosis?
The process of releasing substances from the cell when vesicles fuse with the membrane.
