Diffusion - Movement of particles down a concentration gradient from high to low concentration., Concentration gradient - Difference in solute concentration between two regions (e.g. across membranes)., Surface area to volume ratio (SA:Vol) - Relationship between an organism’s surface area and volume., Vertebrates - Animals with a backbone (mammals, birds, reptiles, amphibians, fish)., Mass transport system - Structures that transport substances in fluid flow around the body., Single circulation system - Blood passes through the heart once per circuit (e.g. fish)., Double circulation system - Blood passes through the heart twice per circuit (pulmonary + systemic)., Systemic circulation - Circulation carrying oxygenated blood to body cells and returning deoxygenated blood., Pulmonary circulation - Circulation carrying deoxygenated blood to lungs and oxygenated blood back to heart., Oxygenated blood - Blood carrying oxygen., Deoxygenated blood - Blood that has released its oxygen to body cells.,

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