Level 2
Level 1

Cells, Tissues and Organs


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cell membrane
The membrane around the contents of a cell which controls what moves in and out of the cell.
cell wall
A rigid structure which surrounds the cells of living organisms apart from animals.
cytoplasm
The water-based gel in which the organelle of all living cells are suspended.
concentration gradient
The gradient between an area where a substance is at a high concentration and an area where it is at a low concentration.
diffusion
The net movement of particles of a gas or a solute from an area of high concentration to an area of low concentration (along a concentration gradient).
digestive system
The organ system running from the mouth to the anus where food is digested.
epidermal tissue
The tissue of the epidermis - the outer layer of an organism.
epithelial tissue
Tissue made up of relatively unspecialised cells which line the tubes and organs of the body.
glandular tissue
The tissue which makes up the glands and secretes chemicals e.g. enzymes, hormones.
mesophyll tissues
The tissues in a plant in which photosynthesis occurs.
multicellular organism
An organism which is made up of many different cells working together. Some of the cells are specialised to carry out particular functions.
light microscope
An instrument used to magnify specimens using lenses and light.
chlorophyll
The green pigment contained in the chloroplasts.
net movement
The overall movement of...
chloroplast
The organelle in which photosynthesis takes place.
muscular tissue
The tissue that makes up the muscles. It can contract and relax.
nucleus
An organelle found in many living cells. It contains the cell's genetic information.
organ
A group of different tissues working together to carry out a particular function.
organ system
A group of different organs working together to carry out a particular function.
permanent vacuole
A space in the cytoplasm filled with cell sap that is present all the time.
phloem tissues
The living transport tissue that carries sugars around plants.
plasmids
Extra circles of DNA found in bacterial cytoplasm.
small intestine
The region of the digestive system where the majority of digestion occurs.
specialised
Adapted for a particular function.
tissue
A group of specialised cells all carrying out the same function.
xylem tissue
The non-living transport tissue in plants, which transports water around the plant.