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Cells. W Richards Worthing High School. Please note – some of the animation effects used here only work in PP XP. Using a microscope. 1. Eyepiece. 2. Arm. 7. Lenses. 6. Stage. 3. Focus adjustor. 5. Mirror. 4. Base. Plant cells vs. Animal cells. 4). 1). 2). 5). 3). 6). - PowerPoint PPT Presentation
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20/04/23
CellsCells
W Richards
Worthing High School
Please note – some of the animation effects used here only work in PP XP
20/04/23
Using a microscopeUsing a microscope
1. Eyepiece
3. Focus adjustor
2. Arm
4. Base5. Mirror
6. Stage
7. Lenses
20/04/23
4)1)
5)
6)
2)
3)
Plant cells vs. Animal Plant cells vs. Animal cellscells
Both types of cell have these: Only plant cells have these:
Cell wall – provides support
Large Vacuole – contains sap
Chloroplasts – contain chlorophyll
Cell Membrane – holds the cell together
Cytoplasm - this is where the reactions happen
Nucleus – The “brain” of the cell
20/04/23
Specialised cellsSpecialised cellsConsider the root hair cell:
It is “suited” to its job of taking in water and nutrients in 2 ways:
1) It has a large surface area
2) It has a thin cell membrane
The sperm cell is another example of a specialised cell:
Strong tail for swimming
Vacuole containing enzymes
20/04/23More specialised animal More specialised animal cellscells
Red Blood Cell
Carries oxygen around the body
No nucleus and large surface area
I.D:
Function:
Features:
White blood cell
Egg cell (ovum)
Ciliated epithelial cell
Nerve cell (neurone)
20/04/23Cells, tissues, organs and Cells, tissues, organs and systemssystems
Basically, all living things are made up of cells…
A group of CELLS makes up a TISSUE
A group of TISSUES makes up an ORGAN
A group of ORGANS makes up a SYSTEM
A group of SYSTEMS make up an ORGANISM
20/04/23
Another exampleAnother exampleHere’s another example in humans:
Muscle cells
Muscle tissue
Organ
System
Organism
20/04/23
Cell growthCell growthAnimal cells:
Plant cells:
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Plant reproductionPlant reproductionFor a plant to reproduce two stages must happen:
Stage 1: Pollination – pollen from one plant is taken to another by insects or the wind:
20/04/23
Plant reproductionPlant reproductionStage 2: Fertilisation – a pollen tube grows down through the style and the pollen grain (which contains the male sex cell) travels down the tube to fertilise the female egg cell:
Ovaries