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Transcript
LIFE SCIENCE– CELL MEMBRANE What is the purpose of the cell membrane? PL E ____________________________________________________________________________________ How is the cell membrane like a security guard? ____________________________________________________________________________________ List three substances that can easily pass through the cell membrane. ____________________________________________________________________________________ Why is the cell membrane considered ‘semi-permeable’? AM ____________________________________________________________________________________ Fill in the chart below displaying the three ways a substance can move through a cell membrane. Method Particles that pass through Is energy required? Direction of flow Diffusion Osmosis EX Active Transport Why do you think active transport requires energy while diffusion and osmosis do not? ____________________________________________________________________________________ ____________________________________________________________________________________ LIFE – CELL MEMBRANE What is the purpose of the cell membrane? PL E It controls what goes in and out of the cell._________________________________________ How is the cell membrane like a security guard? Security guards decide who enters a building and a cell membrane decides what enters a cell._ List three substances that can easily pass through the cell membrane. Oxygen, Carbon Dioxide, Water___________________________________________________ Why is the cell membrane considered ‘semi-permeable’? AM Not everything is allowed to enter.________________________________________________ Fill in the chart below displaying the three ways a substance can move through a cell membrane. Method Particles that pass through Is energy required? Direction of flow Diffusion Anything No HIGH LOW Osmosis Water No HIGH LOW Anything Yes LOW HIGH EX Active Transport Why do you think active transport requires energy while diffusion and osmosis do not? It is harder to pull in particles when they are abundant inside the cell and scarce outside the cell. An area with a high concentration is more likely to want to travel to a low concentration._