26 terms

Cell Organelles

Definitions of organelles and their functions
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Terms in this set (...)

Active Transport
The movement of materials across a cell membrane using cellular energy.
Cell
The basic unit of life
Cell Membrane
A thin, flexible barrier that surrounds a cell and controls which substances pass into and out of a cell.
Cell Theory
A widely accepted explanation of the relationship between cells and living things.
Cell Wall
A rigid supporting layer that surrounds the cells of plants and some other organisms.
Chloroplast
An organelle in the cells of plants and some other organisms that captures energy from sunlight and changes it to an energy form that cells can use in making food.
Cytoplasm
The thick fluid region of a cell located inside the cell membrane or between the cell membrane and nucleus.
Endocytosis
The process by which the cell membrane takes particles into the cell by changing shape and engulfing the particles.
Endoplasmic reticulum
An organelle that forms a maze of passageways in which proteins an other material are carried from one part of the cell to another.
Exocytosis
The process by which the vacuole surrounding particles fuses with the cell membrane, forcing the contents out of the cell.
Golgi apparatus
An organelle in a cell that receives proteins and other newly formed materials from the endoplasmic reticulum, packages them, and distributes them to other parts of the cell.
Lysosome
A cell organelle which contains chemicals that break down large food particles into smaller ones and that can be used by the rest of the cell.
Mitochondria
Rod-shaped organelles that convert energy in food molecules to energy the cell can use to carry out its functions.
Multicellular
Composed of many cells.
Nucleus
In cells, a large oval organelle that contains the cell's genetic material in the form of DNA and controls many of the cell's activities.
Organ
A body structure that is composed of different kinds of tissues that works together.
Organ System
A group of organs that work together to perform a major function.
Organelle
A tiny cell structure that carries out a specific function within the cell.
Osmosis
The diffusion of water molecules across a selectively permeable membrane.
Passive Transport
The movement of dissolved materials across a cell membrane without using cellular energy.
Ribosome
A small grain-shaped organelle in the cytoplasm of a cell that produces proteins.
Selectively Permeable
A property of cell membranes that allows some substances to pass across it, while others cannot.
Tissue
A group of similar cells that perform a specific function.
unicellular
Made of a single cell.
Vacuole
A sac-like organelle that stores water, food, and other materials.
Chloroplast

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