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cells
cell & membrane structure
| Question | Answer |
|---|---|
| Cell theory | a scientific theory that all living things are made up of cells, all the functions occur within cells and all cells come from already existing cells (materials produced by cells) |
| Cell 6 main parts | Cell/plasma membrane: Cytoplasm: Cytosol: Cytoskeleton: Inclusions: Organelle: |
| Cytoplasm | made up of organelles and cytosol, contents of cell |
| Cytosol | liquid part of cytoplasm of a cell |
| Cell/plasma membrane | external boundary of the cell which determines which substances get into & out of the cell |
| Cytoskeleton | internal scaffolding |
| Inclusions | chemical substances inside a cell in the form of granules or droplets.eg haemoglobin in red blood cells |
| Organelle - edit | structure within cytoplasm of a cell with specific functions |
| Extracellular | fluid outside the cell eg tissue fluid, blood plasma |
| Intracellular | fluid found inside the cell |
| Cell requires | Water Proteins (amino acids) Salts (ions) Fats (lipids) Sugar (glucose) → carbohydrates Oxygen Expel co2 and other waste Expel cell products Vitamins and minerals |
| fluid mosaic model | Phospholipids: lipid molecule containing phosphate group Arranged in a bilaye so the water proof head is outside and tail is inside Protein:4 types - channel, carrier, receptor and recognition Cholesterol: stabilize structure Carbs |
| permeable/ semi-permeable | permits the passage of certain substances (usually small) but restricts the passage of others (usually large) |
| facilitated transport | the process wheye by proteins in the cell membrane allow molecules to be transported across the membrane |
| Channel proteins | a protein that allows ions, water & small molecules to pass through the cell membrane |
| Carrier proteins: | proteins that carries substances from one side of the cell to the other Active Special carrier proteins - will only bind to molecules that fit. Can become saturated . Regulated by hormones. Glucose, ions, amino acids |
| Vesicular transport | transport of materials into and out of a cell in membrane bound sacs called vesicles |
| Endocytosis | cell takes in materials by enfolding& enclosing Pinocytosis- liquids Phagocytosis - solids |
| Exocytosis | contents of vesicles are pushed out Excretion of water & secretions Mucus & digestive juices |
Created by:
procrast
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