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Section 3-3, 3-4, 3-5 Movement across the c ell membrane Write everything that is underlined.

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Presentation on theme: "Section 3-3, 3-4, 3-5 Movement across the c ell membrane Write everything that is underlined."— Presentation transcript:

1 Section 3-3, 3-4, 3-5 Movement across the c ell membrane Write everything that is underlined

2 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport 3.3 KEY CONCEPT: The cell membrane is a barrier that separates a cell from the external environment.

3 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Cell membranes are composed of two phospholipid layers. It forms a boundary between inside and outside of the cell It forms a boundary between inside and outside of the cell …and controls passage of materials …and controls passage of materials cell membrane outside cell inside cell

4 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport cell membrane The cell membrane is made of a phospholipid bilayer. The cell membrane is made of a phospholipid bilayer. There are other molecules embedded in the membrane. There are other molecules embedded in the membrane. The fluid mosaic model describes the membrane. The fluid mosaic model describes the membrane. protein cholesterol protein carbohydrate chain protein channel

5 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport How many layers is the cell membrane made up of? a.1 b.2 c.3 d.4

6 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport The cell membrane is selectively permeable (only certain things get through) like a screen door The cell membrane is selectively permeable (only certain things get through) like a screen door

7 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport 3.4 KEY CONCEPT: Materials move across membranes because of concentration differences.

8 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Passive transport does not require energy There are two types of passive transport:There are two types of passive transport: 1.diffusion 2.osmosis

9 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport 1.Diffusion: Molecules move down a concentration gradient From an area of high concentration to low concentrationFrom an area of high concentration to low concentration

10 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Osmosis is the diffusion of waterOsmosis is the diffusion of water There are three types of solutions: isotonic, hypertonic, hypotonicThere are three types of solutions: isotonic, hypertonic, hypotonic

11 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport What is passive transport? a.Does not require energy to move materials b.Requires energy to move materials c.Depends on your definition of movement d.Only sometimes does it use energy

12 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport What is/are the different types of passive transport? a.Diffusion b.Isotonic c.Osmosis d.A and C

13 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Diffusion is the movement of materials from an area of ___________ concentration to ______ concentration a.Low to High b.High to High c.Low to Low d.High to Low

14 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Osmosis it the diffusion of ___________ a.Materials b.Sugar c.Water d.Amino acids

15 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Some molecules can only diffuse through transport proteins. Facilitated diffusion: diffusion through transport proteins

16 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport 3.5 KEY CONCEPT: Cells use energy to transport materials that cannot diffuse across a membrane.

17 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Active transport requires energy to move a substance against its concentration gradient (from LOW to HIGH) Passive transport requires no energy from the cellPassive transport requires no energy from the cell Active transport is powered by chemical energy (ATP)Active transport is powered by chemical energy (ATP) Cells use active transport to maintain homeostasisCells use active transport to maintain homeostasis

18 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport A cell can import and export large materials or large amounts of material in vesicles during the processes of endocytosis and exocytosis. Endocytosis is the process of taking material into the cell – also called PhagocytosisEndocytosis is the process of taking material into the cell – also called Phagocytosis

19 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport Exocytosis is the process of expelling (pushing out) material from the cellExocytosis is the process of expelling (pushing out) material from the cell

20 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport What is the difference between active transport and passive transport? a.Active requires energy and passive does not b.Passive requires energy and active does not c.Passive moves big materials into the cell and active does not d.B and C

21 3.3 Cell Membrane / 3.4 Diffusion / 3.5 Transport What does the following picture show? a.Endocytosis b.Exocytosis c.Diffusion d.Osmosis


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