B2 - Scaling up definitions 0.0 / 5 ? BiologyScaling upGCSEOCR Created by: munchlee142002Created on: 02-03-18 22:46 Diffusion Net movement of particles from a place where there is a high concentration, to one where there is a low concentration 1 of 28 Concentration gradient Difference in concentration between two regions 2 of 28 Osmosis Diffusion of water molecules from region of high water concentration to low concentration through a selctively permeable membrane 3 of 28 Water potential Concentration of free water molecules 4 of 28 Mitosis When a cell produces itself by splitting to form two identical offspring 5 of 28 Meristems Unspecialised stem cells in plants are grouped together in structures 6 of 28 Differentiation Conversion of cell from unspecialised to specialised 7 of 28 Diffusion distances Distance over which a molecule diffuses 8 of 28 Exchange surfaces An area where materials are interchanged 9 of 28 Double circulatory system A system in which blood travels through the heart twice in each circuit of the body 10 of 28 Alveoli Air sac in the lung which increases the surface area 11 of 28 Arteries Blood vessel that carries blood away from the heart 12 of 28 Atria Upper chamber of the heart (singular - atrium) 13 of 28 Capillaries Small blood vessels that carry blood close to all cells in the body. They link arterioles and venules 14 of 28 Heart Muscular organ which pumps blood around the body 15 of 28 Lumen The open channel within a tube 16 of 28 Phloem Tissue that transports dissolved sugar around a plant 17 of 28 Specialised A cell that is adapted to perform a particular function is called a specialised cell 18 of 28 Stem cell Undifferentiated cell 19 of 28 Villi Finger-like projections on the intestine wall, which increase the surface area 20 of 28 Veins Blood vessel that carries blood towards the heart 21 of 28 Semipermeable membrane A membrane which only allows certain molecules to pass through it 22 of 28 Ventricles Lower chamber of the heart 23 of 28 Valves Structure that controls the direction of flow 24 of 28 Translocation Movement of sugars from the leaf to stores in the roots, or to growing areas of a plant 25 of 28 Xylem Tissue that transports water around a plant 26 of 28 Transpiration Loss of water from the leaves of a plant 27 of 28 Transpiration stream The flow of water through a plant caused by the loss of water from a plant's leaves 28 of 28
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