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Terms in this set (32)

concentration gradient

the process of particles moving through a solution from an area of higher number of particles to an area of lower number of particles. The areas are typically separated by a membrane.

dynamic equailibrium

A system in a steady state since forward reaction and backward reaction occur at the same rate.

Hypertonic solution

causing water to move out of the cell because there is a higher concentration of solutes outside the cell than inside the cell.

hypotonic solution

too much water inside the cell because there is a lower concentration of solutes outside the cell than inside the cell.

isotonic solution

water molecules moving in and out of the cell move at the same rate. Causing the cell to have a normal shape

Plasma membrane

the boundary between the cell and its environment. It regulates what enters and exits the cell.

Plasma membrane structure

The plasma membrane is composed of two layers of phospholipids back-to-back. Phospholipids are lipids with a phosphate group attached to them.

Plasma membrane function

it regulate what enters and leaves the cell

Osmosis is the movement of water through a plasma membrane from a region of low solute concentration to a region of high concentration. Osmosis is passive transport, meaning it does not require energy to be applied.

Rough verses Smooth ER

Rough ER is called rough because it has ribosomes attached to its surface.

structures that help with cell movement

Microtubules
flagella
cilia

all cells come from other cells
all living things are made of cells
cells are the basic unit of life

the net passive movement of particles from a region in which they are in higher concentration to regions of lower concentration.

passive transport

diffusion without the use of energy

Image: passive transport

active transport

requires energy, is against concentration gradient, pump

Image: active transport