The document reviews key concepts related to cells, tissues, and organs for stage 3 students, explaining the function and structure of cells such as the cell wall, cytoplasm, and nucleus. It introduces specialized cells that perform specific functions within the body, along with examples of various specialized cells and their roles. Additionally, it describes tissues as groups of similar cells and defines organs as structures made up of different tissues working together.

1. CELLS TISSUES AND ORGANS Aims To review key stage 3 Cells, tissues and organs. To review specialised cells www.sciencetutors.zoomshare.com

2. CELLS TISSUES & ORGANS AT A GLANCE A QUICK RECAP

3. What are Cells? Review pupils' knowledge of cells Ask questions about the roles these parts play in the life of the cell {Animal Cell} Cell Wall Cytoplasm Nucleus www.sciencetutors.zoomshare.com

4. Facts About Cell Wall The cell wall is thin skin around the cell The cell wall gives the cell its shape The cell wall regulates what goes into and out of the cell The lack of a rigid cell wall allowed animals to develop a greater diversity of cell types, tissues, and organs. You should know that www.sciencetutors.zoomshare.com

5. Facts About Cytoplasm The cytoplasm is the part of a cell that is enclosed within the cell wall {it fills the interior of the cell} The main function of the cytoplasm is to hold the basic components {called cell organelles} which controls the activities and functions of the cell. You should know that www.sciencetutors.zoomshare.com

6. Facts About Nucleus The nucleus consists of four basic sub structures – nuclear envelope, nucleolus, chromatin and nucleoplasm Nuclear Envelope: selectively allows or controls the movement of certain substances or chemicals into or out of the cell nucleus. Chromatin: made up of very thin DNA strands which issues instructions for heredity and cell metabolism Nucleolus: Is the site where DNA instructions or information are duplicated or copied. It also helps in protein synthesis along side organelles called ribosomes . You should know that www.sciencetutors.zoomshare.com

7. The Nucleus The nucleus controls what the cell does and is the ‘biological bank’ that contains the instructions to make new cell You should know that www.sciencetutors.zoomshare.com

8. SPECIALISED CELLS What does specialised mean? Explain the concept ‘specialised cells’ Make a list of specialised cells in your body Quick quiz 5 minutes www.sciencetutors.zoomshare.com

9. SPECIALISED CELLS Many cells in your body look different because they have their own specific or special jobs to do. Specialised cells are cells in plants and animals that carry out specific functions or do special jobs or a particular job. You should know that www.sciencetutors.zoomshare.com

10. How Specialised are these Cells? Red blood cells Nerve cells Bone cells Sperm cells Egg cells Muscle cells Leaf palisade cells Xylem cells Root hair cells Why are these cells specialised cells? What are their functions www.sciencetutors.zoomshare.com

11. TISSUES Say whether this statement is TRUE, FALSE or NOT SURE and explain your choice of answer. Cells are the basic units or building blocks of life and are organized into tissues from which organs are made www.sciencetutors.zoomshare.com

12. WHAT ARE TISSUES? A group of similar cells {cells that look the same and do the same job} is called a tissue www.sciencetutors.zoomshare.com

13. WHAT ARE ORGANS An organ is made up of different tissues that work together to do a specific task or job. Is your heart an organ? Yes or No? And explain why. Do you mind explaining why your skin is an organ? www.sciencetutors.zoomshare.com