AQA GCSE B3: Diffusion & Active Transport in Animals 3.0 / 5 based on 1 rating ? BiologyRespiration and exerciseGCSEAQA Created by: HarryCreated on: 18-04-13 19:54 Diffusion of water through a partially permeable membrane from high to low concentration Osmosis 1 of 17 Biconcave cells; the only ones with no nucleus in the human body Red blood cell 2 of 17 The term for the difference in concentration of a substance; what molecules move down during diffusion or osmosis Concentration gradient 3 of 17 The movement of a gas or solution from high to low concentration Diffusion 4 of 17 The movement of particles against a concentration gradient; involves energy from respiration Active transport 5 of 17 The structure that aids movement of particles in active transport Transport protein 6 of 17 75% of body mass Water 7 of 17 The term that describes an equal concentration of mineral ions and body fluid; often used in sports drinks Isotonic 8 of 17 Small, spongy structures in the lungs used for exchange of gases Alveoli 9 of 17 Movement of oxygen and CO2 in opposite directions in and out of the bloodstream Gaseous exchange 10 of 17 What happens to the diaphragm when you inhale Contracts 11 of 17 The direction the ribcage moves when you exhale Down 12 of 17 Thorax volume increases when you do this Inhale 13 of 17 Thorax pressure increases when you do this Exhale 14 of 17 A feature of alveoli to increase exchange of gases, concerning distance Thin epithelium 15 of 17 The alveoli have a rich supply of these to increase diffusion Capillaries 16 of 17 Absorption and diffusion surfaces in the small intestine Villi 17 of 17
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