Explain what happens or to lactic acid once exercise stops. Add boiling water to 4.2.1.2 A single-celled organism Explain the cell, 1 Calculate and compare Torso, models or two different sized has a relatively surface tissue, organ, organ surface area: volume ratios images of systems, beakers and take area to volume ratio. system and organism, models or images of Recap KS3 work on temperature over 5–10 and be able to give organs showing The tissues of a organisation using models minutes. Plot line examples of each. different tissues. multicellular organism and images of the human graphs and students consist of with a similar Have an body and organs. Microscope slides or suggest reasons for structure and function. understanding of the bio-viewers. Prepare a set of cards with differences. Work out Organs, such as the heart size and scale of images of different body the SA:volume ratio. and lungs, are made of cells, tissues, organs, organs and ask students to tissues. One organ may organ systems and Working arrange the cards into organ consist of several tissues. organisms. collaboratively, systems. What is the function Organ systems, such as the students investigate of each organ within its circulatory system, are relationship between system? groups of organs that surface area and Students agree criteria to perform a particular volume. Groups make help them evaluate how function. one cube each 1 × 1 × effective different parts of the 1 10 × 10 × 10. – In multicellular organisms body are at allowing diffusion. Discuss link between many organ systems are SA, volume and specialised for exchanging diffusion. materials. The effectiveness of an exchange surface is Students draw graphs: increased by: length of side against SA; against volume; against SA:volume
Explain what happens to lactic acid once exercise stops. or 4.2.1.2 A single-celled organism has a relatively surface area to volume ratio. The tissues of a multicellular organism consist of with a similar structure and function. Organs, such as the heart and lungs, are made of tissues. One organ may consist of several tissues. Organ systems, such as the circulatory system, are groups of organs that perform a particular function. In multicellular organisms many organ systems are specialised for exchanging materials. The effectiveness of an exchange surface is increased by: Explain the cell, tissue, organ, organ system and organism, and be able to give examples of each. Have an understanding of the size and scale of cells, tissues, organs, organ systems and organisms. 1 Calculate and compare surface area: volume ratios Recap KS3 work on organisation using models and images of the human body and organs. Prepare a set of cards with images of different body organs and ask students to arrange the cards into organ systems. What is the function of each organ within its system? Students agree criteria to help them evaluate how effective different parts of the body are at allowing diffusion. Add boiling water to two different sized beakers and take temperature over 5–10 minutes. Plot line graphs and students suggest reasons for differences. Work out the SA:volume ratio. Working collaboratively, students investigate relationship between surface area and volume. Groups make one cube each 1 × 1 × 1 – 10 × 10 × 10. Discuss link between SA, volume and diffusion. Students draw graphs: length of side against SA; against volume; against SA:volume Torso, models or images of systems, models or images of organs showing different tissues. Microscope slides or bio-viewers.