1. Section 1 – Cells, tissues & organs

2. 1)Which of the labelled structures above Indicates this is a plant cell? 2) What is the name of this structure? 3) Identify the structures labelled above 4) Which of these would NOT be found In an animal cell?

3. All of these are different cells found in humans

5. * Why are there so many different types of cells? * How do we get all these different types of cell?

6. * Today we will learn: * - how cells are organised * - examples of tissues and organs in the human body * - why many different cell types can arise from an original cell

7. * Cells are the basic unit of life * - they can carry out all the functions needed for life * Many living organisms are composed of only one cell * - e.g. an amoeba * Most living organisms are made of many millions of cells * It would be inefficient if every cell performed exactly the same function * So, cells are arranged into tissues * - groups of cells specialised to form a particular function * Some of these are arranged into distinct structures – organs * - e.g. nerve cells form tissues which form the brain

8. SCN 3-12a How many other organs do you know? Lungs (Breathing system) Stomach (Digestive system) Liver Heart (Circulatory system) Small intestine Large intestine

9. * An organism with many different cells is multicellular * Cells will vary in size, shape, and structure * - this allows these cells to perform different functions * - e.g. a liver cell and brain cell have very different structures and functions Liver CellBrain cell

10. * All cells in a particular organism start off identical * All of these will contain the same genes * As they start to specialise, some genes switch off, whilst others stay on * The genes left on will carry information for specific functions * E.g. a nerve cell will have genes for producing nerve fibres switched on * http://www.twigonglow.com/films/differen t-types-of-cell-1042/ http://www.twigonglow.com/films/differen t-types-of-cell-1042/

11. * 1) Genes control the activity of the cell. In which part of a cell are they found? * 2) Which substance do red blood cells transport around the body? * 3) Which organelle allows leaf cells to absorb sunlight * 4) What is the function of a root cell in a plant?