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National 4/5 Biology - Multicelluar Organisms

National 4/5 Biology - Multicelluar Organisms. Section 1 – Cells, tissues & organs. 1) Name 3 types of tissue in humans. 2) Name 1 type of tissue in plants 3) For each can you name a particular specialised cell found in that tissue. Re-Cap. Today we will learn:

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National 4/5 Biology - Multicelluar Organisms

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  1. National 4/5 Biology- Multicelluar Organisms Section 1 – Cells, tissues & organs

  2. 1) Name 3 types of tissue in humans. • 2) Name 1 type of tissue in plants • 3) For each can you name a particular specialised cell found in that tissue Re-Cap

  3. Today we will learn: • - the structure and function of a variety of cells in plants and animals • - why these specialised cells are suited to their particular functions • - Learning Outcomes

  4. SPECIALISED CELLS – ANIMALS SPERM CELLS Head contains enzymes & nucleus Found in the testes Tail Designed to fertiliseeggs. Can you think why these two features are important?

  5. Sperm cell Found in the Testes Designed to Fertilise eggs. Head contains enzymes & nucleus Tail A sperm’s long tail provides movement so it can swim and find an egg cell. The head contains enzymes which allow it to digest into an egg cell and join with it.

  6. Egg (Ovum) Cell • Designed to be fertilised • Found in the ovaries Cytoplasm Egg membrane Nucleus

  7. Ciliated Cell • Designed to stop lung damage • They line all the air passages in the lungs • They have tiny hairs called cilia. • Cilia sweep mucuswith trapped dust and bacteria back up the throat.

  8. Red Blood Cell • Designed to carry oxygen • Found in blood. • Large surface area, for oxygen to pass through. • Contains haemoglobin, which joins with oxygen. • Has no nucleus

  9. CHEEK EPITHELIAL CELL Have a flat, irregular shape Form layers which protect the skin surface

  10. NEURONES - a type of nerve cell • Have a long cytoplasm • insulated with myelin Transfer nerve signals

  11. Complete the table on the handout sheet, by filling in the cell types, structures & functions of 4 different animal cells Your Task

  12. Specialised cells & functions -animals

  13. Specialised cells & functions -animals

  14. Specialised cells - plants Palisade Mesophyll Cell • Designed for photosynthesis • - packed with chloroplasts • Found near the top of a leaf • Has a large surface area • - to absorb water and minerals. Nucleus Chloroplasts

  15. Root Hair Cell • Thin cell wall makes it easy for minerals to pass through. Long extension for absorbing Vacuole thin cell wall • Large surface area • - helps absorb water and minerals. Cell membrane • Found in a plant root.

  16. GUARD CELL Have a sausage shape Thick inner cell wall Can stretch to open a pore These pores are called stomata Stomata allow gases to enter/exit plants

  17. XYLEM & PHLOEM Xylem are hollow vessels Lined with lignin Phloem run alongside xylem They have companion cells - control the phloem Help transport water Phloem transports sugar

  18. Complete the table on the handout sheet, by filling in the cell types, structures & functions of 4 different plant cells Your Task

  19. Specialised cells & functions - plants

  20. Specialised cells & functions - plants

  21. You will now be given a set of cards with types of cells, and their functions and features • You are required to match the cards under the following headings Your Task

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