Other Chapters' Lyrics:
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
Other Chapters' Notes:
Earth Science 1 - 2 - 3 - 4 - 5 - 6 - 7 - 8 - 9 - 10 - 11 -:- Life Science 1 - 2 - 3 - 3b - 4 - 4b - 5 - 6 - 7 - 8 - 9 - 10 - 11 - 12 -:- Physical Science 3
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Life Science Chapter 4 - Summary Notes
How do cells live and grow?
- Osmosis: water moving through a cell membrane
- But while water is very small, and small enough to get through the membrane while other molecules like sugar need to travel through protein “doorways” by passive transport (with the flow) or active transport (against the flow).
- Really large things get in the cell by endocytosis which is the engulfing like putting the whole hotdog in your mouth at one time.
- Exocytosis is the way a cell spits out large waste particles.
- A cell’s energy
- In plants comes from photosynthesis where there is the conversion of light (photons) from the sun, reacting with carbon dioxide and water to form food (a sugar called glucose) and oxygen. Photosynthesis occurs in the chloroplasts.
- In animals’ cells, glucose reacts with oxygen to form carbon dioxide and water and ATP (the energy for the animal’s cells) and heat to keep the animal warm. This is called cellular respiration and all this is done in a small part of the cell call the mitochondria.
- That’s why plants and animals are so good together: using sunlight, the plants make the food for the animals and then animals use that food to make their own energy and to make the food for the plants.