Section 3: The Organization of Living Things Flashcards
tissue
a group of similar cells that preform a common function.
organ
a collection of tissues that carry out a specialized function of the body.
organ system
a group of organs that work together to preform body functions.
organism
a living thing; anything that can carry out life processes independently.
structure
the arrangement of parts in an organism.
function
the special, normal, or proper activity of an organ or part.
diffusion
the movement of particles from regions of higher density to regions of lower density.
osmosis
the diffusion of water through a semipermeable membrane.
passive transport
the movement of substances across a cell membrane without the use of energy by the cell.
active transport
the movement of substances across the cell membrane that requires the cell to use energy.
endocytosis
the process by which a cell membrane surrounds a particle and encloses the particle in a vesicle to bring the particle into the cell.
exocytosis
the process in which a cell releases a particle by enclosing the particle in a vesicle that then moves to the cell surface and fuses with the cell membrane.
