Diffusion

Selectively (semi) permeable:

A semi-permeable membrane is a membrane that allows some particles to pass through (oxygen, carbon dioxide). Whereas the selectively permeable membrane “chooses”  what passes through (water).

Diffusion:

The process by which particles spread out from an area of higher concentration to an area of lower concentration. 

Active transport:

Molecules move the concentration from low to high uphill. This carries a carrier protein which requires ATP. 

Endocytosis:

Bringing things into the cell

Isotonic: 

The solution has the same concentration of solutes as found in the cell. Cells that are exposed retain normal shape.

Hypotonic:

The solution has a lower concentration of solutes than in the cell. Cells plump up as water rushes in. 

Hypertonic:

The solution has a higher concentration of solutes than seen in the cell when immersed cells will lose water and shrink.

Facilitated Solution:

When molecules are transported passively even though they are unable to pass through the lipid layer (protein).

Simple Diffusion:

When noncharged molecules go through the lipid layer (oxygen, carbon dioxide).

Osmosis:

Occurs when water concentration differs on each side of the membrane. 

Exocytosis:

Exit the cell.

Passive Transport:

A type of membrane transport that does not require energy to move substances across cell membranes.

Mitosis:

The process by which a cell replicates its chromosomes and then segregates them, producing two identical nuclei in preparation for cell division.

Passive Transport mechanisms:

Diffusion, osmosis, facilitated diffusion.

Active Transport Mechanisms:

Active transport, endocytosis, exocytosis.