GCSE Biology: Circulatory System

GCSE OCR Biology: B2.2 The Challenges of Size

All resources for B2.2 The Challenges of Size GCSE OCR Biology Gateway 9-1. Triple and combined (Higher and Foundation) is covered in this material. Each PowerPoint is a whole lessons included with student activities and animated answers. * Calculating total surface area of a cube * Calculating volume of a cube * Calculating surface area to volume ratio * Exchange surfaces in the alveoli and villi * A large surface area to volume ratio allows diffusion to occur. * The circulatory system is a closed system. * Recap: Aerobic Respiration * Structure of arteries, veins, and capillaries. * Blood flows through the heart twice in every circuit of the body - the double circulatory system. * Left and right in the heart * The four chambers of the heart * Labeling the heart * Circulation of blood around the body * The components of blood and their functions * Plasma * Red blood cells * White blood cells * Platelets * Structure and function of xylem. * Structure and function of phloem. * Water enter the plant from the root hair cells by osmosis. * Mineral ions enter the plant from the root hair cells by active transport. * Sugars are produced in the leaves (chloroplasts) during photosynthesis. * Water diffuses into the root hair cells by osmosis. * Water moves up the stem through the xylem. * Water is lost from leaves by evaporation through open stomata. * Labelling the stomata * The role of the cuticle * How water loss efftects the stomata * Factors that affect the rate of transpiration: * Light intensity * Temperature * Air movement (wind) * Humidity. * How open stomata increase the rate of transpiration. * Graphs of rate of transpiration against different variables. * Concentration gradients and rate of transpiration * Calculations of the rate of transpiration.