BRAINCAKEExchange and transport in animals
Revision notes for Exchange and transport in animals in Edexcel Biology (1BI0). Every lesson in BrainCake comes with R.E.C.I.P.E. recall steps, a quick check and spaced reviews.
- Why substances must be transportedEvery living cell needs to take in some substances and get rid of others.
- Exchange surfaces and transport systemsA single-celled organism such as an amoeba is very small.
- Alveoli and the rate of diffusionGas exchange in the lungs happens in millions of tiny air sacs called alveoli.
- Factors affecting the rate of diffusionDiffusion is the net movement of particles from a region of higher concentration to a region of lower concentration.
- Calculating the rate of diffusion using Fick's lawFick's law puts the three factors from the last lesson into one relationship.
- The structure and function of bloodBlood is made of plasma, red blood cells, white blood cells and platelets.
- Arteries, veins and capillariesThere are three types of blood vessel, and each has a structure that suits its job.
- The heart and the circulatory systemHumans have a double circulatory system.
- Cellular respirationCellular respiration is the chemical process that releases energy from glucose in living cells.
- Aerobic and anaerobic respiration comparedAerobic respiration needs oxygen.
- Core practical: rate of respirationA simple respirometer measures the rate of respiration of small living organisms such as woodlice or germinating peas.
- Heart rate, stroke volume and cardiac outputCardiac output is the volume of blood pumped by the heart in one minute.