Moving Substances Across Cell Membrane • cell membrane is semi–permeable • Some molecules pass through easily, some need help • Some molecules pass through without the expenditure of energy (spontaneous) and some require an input of energy (ATP) What molecules move IN and OUT of a cell: • Small nonpolar molecules (CO 2 , O 2 ) • Small polar molecules such as water • Ions and charged molecules • Large polar molecules (eg. Glucose) • Macromolecules Movement IN and OUT can Be PASSIVE or ACTIVE
Moving Substances Across Cell Membrane. cell membrane is semi–permeable Some molecules pass through easily, some need help Some molecules pass through without the expenditure of energy (spontaneous) and some require an input of energy (ATP) What molecules move IN and OUT of a cell: - PowerPoint PPT Presentation
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Moving Substances Across Cell Membrane
• cell membrane is semi–permeable
• Some molecules pass through easily, some need help• Some molecules pass through without the expenditure of energy
(spontaneous) and some require an input of energy (ATP)
What molecules move IN and OUT of a cell:
• Small nonpolar molecules (CO2, O2)• Small polar molecules such as water • Ions and charged molecules• Large polar molecules (eg. Glucose)• Macromolecules
Movement IN and OUT can Be PASSIVE or
ACTIVE
Passive Transport• cell uses no energy • molecules move randomly• Molecules spread out from an area of high