How are molecules transported across the cell membrane?

How are molecules transported across the cell membrane?

1 Diffusion. Diffusion is a process of passive transport in which molecules move from an area of higher concentration to one of lower concentration. 2 Osmosis. 3 Tonicity. 4 Facilitated transport. 5 The Role of Passive Transport. 6 Primary Active Transport. 7 Electrochemical Gradient.

How are large molecules move down the concentration gradient?

Large molecules such as glucose move down the concentration gradient with the help of proteins facilitated diffusion Diffusion of water molecules through the cell membrane down (with) the concentration gradient osmosis Movement of substances against the concentration gradient; requires energy

How does a cell take in material from its environment?

Process by which a cell surrounds and takes in material from its environment endocytosis Process by which a cell surrounds and removes materials from inside the cell exocytosis Movement of substances across the cell membrane from high concentration to low concentration

When does water become hypertonic to the cell?

Hypertonic to the cell If the concentration of water is the same in the solution as inside a cell, it is Isotonic to the cell Big molecules following the concentration gradient are able to diffuse across a membrane by using a protein channel If the molecules are big and/or go against the concentration gradient, the cell uses Active Transport

How is water transported across a semi permeable membrane?

Semipermeable membranes, also termed selectively permeable membranes or partially permeable membranes, allow certain molecules or ions to pass through by diffusion. While diffusion transports materials across membranes and within cells, osmosis transports only water across a membrane.

How are two solutes moved across a membrane?

Coupled transport If the two solutes are moved across a membrane in the same direction, it is referred to as symport

How is the direction of transport of a molecule determined?

During passive diffusion, a molecule simply dissolves in the phospholipid bilayer, diffuses across it, and then dissolves in the aqueous solution at the other side of the membrane. No membrane proteinsare involved and the direction of transport is determined simply by the relative concentrations of the molecule inside and outside of the cell.