Respiration supplies energy
________ to drive carrier protein across membrane.
Molecules
________ and ions in liquids or a gas move continuously and randomly and so they change direction as they bump into eachother.
Gas exchange
________ in the alveoli of lungs takes place by diffusion.
Temprature on diffusion
________: An increase in temperature will increase the rate of diffusion; Molecules gain kinetic energy and so will move faster (faster diffusion)
Osmosis
________: The net movement of water molecules from a solution of high water potential to a solution of low water potential (down a water potential gradient) across a partially permeable.
Diffusion
________: the net movement of molecules within a gas or liquid from a region of high concentration to a region of low concentration (down a concentration gradient) across a semi permeable membrane, until equilibrium is reached.
solution of low water
When it is immersed in a(n) ________ potential: the cell loses water.
Concentration gradient in diffusion
________: The higher the difference in concentrations the faster the rate of diffusion.
Active transport
________: the movement of molecules from a region of LOWER concentration to a region of HIGHER concentration (against a concentration gradient)
plant cell
When a(n) ________ is placed in a solution of low water potential: water leaves the the cell.
Gas exchange
________ through the stomata of the leaves occurs by diffusion.
Diffusion
the net movement of molecules within a gas or liquid from a region of high concentration to a region of low concentration (down a concentration gradient) across a semi permeable membrane, until equilibrium is reached
Concentration gradient
The higher the difference in concentrations the faster the rate of diffusion
Temprature
An increase in temperature will increase the rate of diffusion; Molecules gain kinetic energy and so will move faster (faster diffusion)
Surface area of the membrane
Larger surface area of the membrane the higher the rate of diffusion
Distance over which diffusing molecules travel
Shorter the distances faster the rate of diffusion
Size of diffusing molecules
Smaller/lighter molecules will move faster and so will have a higher rate of diffusion
Osmosis
The net movement of water molecules from a solution of high water potential to a solution of low water potential (down a water potential gradient) across a partially permeable
When a plant cell is placed in a solution of low water potential
water leaves the the cell
When it is placed in a solution of high water potential
water enters the cell
When it is immersed in a solution of low water potential
the cell loses water
When it is immersed in a solution of high water potential
the cell takes in water
Active transport
the movement of molecules from a region of LOWER concentration to a region of HIGHER concentration (against a concentration gradient)