Chapter 8 Cell Transport Flashcards
(23 cards)
What is Homeostasis
A stable, internal conditions
Cell membrane
Organelle controls the movement of substances into and out of the cell
Selectively permeable
Only allowed certain substances to pass through
Active transport
Requires energy
Passive transport
Moves molecules and ions from high to low concentration with NO energy
What is gonna happen if a cell that was placed in a hypertonic solution
The cell would shrivel
Osmosis
The movement of water down a concentration gradient within the cell
What direction will water move in a cell placed into a hypotonic solution
Into the cell
What direction will water move if the cell is placed into an isotonic solution
Net movement will equal zero
What is an example of an active transport process
A molecular pump
Diffusion
Process by which particles tend to move from an area where they are more concentrated to an area where they are less concentrated
Facilitated diffusion
Process of diffusion in which molecules pass across the membrane through protein channels in the cell membrane
Aquaporin
Water channel protein in a cell membrane
Osmosis
Diffusion of water through a selectively permeable membrane
Isotonic
When the concentration of two solutions is the same
Hypertonic
When comparing two solutions, the solution with the greater concentration of solutes
Hypotonic
When comparing two solutions, the solution with the lesser concentration of solutes
Osmotic pressure
Pressure that must be applied to prevent osmotic movement across a selectively permeable membrane
Tissue
Group of similar cells that perform a particular function
Organ
Group of organs that work together to perform a specific function
Organ system
Group of organs that work together to perform a specific function
Receptor
On or in a cell, a specific protein that receives chemical signals from molecular messengers such as hormones
Level of organisms from smallest to largest
Cell - tissue- organ - organ system
