Cellular Transport Flashcards
Do all cells have a membrane?
Yes
Cell membranes control what enters and exits the cell to maintain internal balance called _____
homeostasis
What provides protection and support for the cell?
Cell Membrane
Lipid Bilayer
two layer of lipid molecules are packed with their hydrophobic tails pointing inward and their hydrophilic heads outward (Butts together)
Phospholipid
molecule that is the main component of a cell membrane
Phosphate head is _________________
polar (water loving)
Fatty acid tail is __________________
nonpolar (water fearing)
________ are embedded in cell membranes
protiens
What is constantly moving in a cell membrane?
fluid
______ heads love water and dissolve.
Hydrophilic
________ tails hide from water
Hydrophobic
What is a lipid bilayer?
Universal component of all cell membranes made up of two layers of fatty acid.
Cell membranes have ____ that helps the structure be selective.
pores
Selectively permeable means:
Allows some molecules in and keeps other out
What is inside of a cell?
cytoplasm
Passive Transport doesn’t use cell energy, instead it uses:
diffusion, facilitated diffusion and osmosis
Active Transport uses cell energy with:
protein pumps, endocytosis and exocytosis
What is endocytosis?
a process by which cells absorb external material by engulfing it with the cell membrane (wrap around the birthday cake)
What is exocytosis?
the process by which cells move materials from within the cell into the extracellular fluid (ATP breaks to create energy and move material)
What is a protein pump?
transmembrane proteins, which are involved in the active transport of ions across the membrane against the concentration gradient
What is Facilitated Diffusion
is a type of diffusion in which the molecules move from the region of higher concentration to the region of lower concentration assisted by a carrier Assisted by a carrier - bicycle downhill
What is Osmosis
osmosis is the movement of water molecules from a solution with a high concentration of water molecules to a solution with a lower concentration of water molecules, through a cell’s partially permeable membrane. Waterslide downhill
Which part of the cell membrane is hydrophobic?
Tail
Which part of the cell membrane is hydrophilic?
Head
