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Transcript
LESSON 3 Moving Cellular Material LESSON INTRODUCTION Get Ready What do you think? Before you begin, decide if you agree or disagree with each of these statements. As you view this presentation, see if you change your mind about any of the statements. LESSON 3 Moving Cellular Material LESSON INTRODUCTION Get Ready Do you agree or disagree? • Diffusion and osmosis are the same process. • Cells with large surface areas can transport more than cells with smaller surface areas. LESSON 3 Moving Cellular Material LESSON INTRODUCTION Key Concepts/Essential Questions • How do materials enter and leave cells? • How does cell size affect the transport of materials? LESSON 3 Moving Cellular Material LESSON INTRODUCTION Vocabulary Watch out for these words! • passive transport • active transport • diffusion • endocytosis • osmosis • exocytosis • facilitated diffusion LESSON 3 Moving Cellular Material LESSON INTRODUCTION Why the Veil? Look at the photo at the beginning of the lesson. A beekeeper often wears a helmet with a face-covering veil made of mesh. The openings in the mesh are large enough to let air through, yet small enough to keep bees out. In a similar way, some things must be allowed in or out of a cell, while other things must be kept in or out. How do the right things enter or leave a cell? LESSON 3 Moving Cellular Material LESSON 3 Moving Cellular Material LESSON WRAP-UP Lesson Review Do you agree or disagree? Diffusion and osmosis are the same process. Disagree. Osmosis is the transport of water, and diffusion is the movement of other substances. LESSON 3 Moving Cellular Material LESSON WRAP-UP Lesson Review Do you agree or disagree? Cells with large surface areas can transport more than cells with smaller surface areas. Agree. To move substances into and out of a cell efficiently, the surface area of a cell must be large compared to its volume. LESSON 3 Moving Cellular Material LESSON WRAP-UP Key Concept/Essential Question Review How do materials enter and leave cells? Materials enter and leave a cell through the cell membrane using passive transport or active transport. LESSON 3 Moving Cellular Material LESSON WRAP-UP Key Concept/Essential Question Review How does cell size affect the transport of materials? The ratio of surface area to volume limits the size of a cell. In a smaller cell, the high surface-area-to-volume ratio allows materials to move easily to all parts of a cell.