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Powerpoint Metabolisme 1

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Powerpoint Bab Metabolisme (Engiish Edition)

Maaf, karena kebutuhan akhirnya jadi dalam bahasa Inggris...

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Powerpoint Metabolisme 1

1. 1. The Cell in Action!!! STATE UNIVERSITY OF SURABAYA By: Ms. Dhita
2. 2. Section 1 Objectives: •Explain the process of diffusion •Describe how osmosis occurs •Compare passive transport with active transport •Explain how large particles get into and out of cells
3. 3. Exchange with the Environment  An organism must be able to obtain energy and raw materials and get rid of waste.  Cell division allows organisms to grow and repair injuries.  Exchange of materials between a cell and its environment takes place at the cell’s membrane.
4. 4. What is Diffusion?  Everything is made up of moving particles.  Particles travel from where they are crowded to where they are less crowded.  This movement from areas of high concentration (crowded) to areas of low concentration (less crowded) is called DIFFUSION  Cells do not need energy to use energy for diffusion
5. 5. Example of Diffusion
6. 6. Diffusion of Water  Cells of organisms are surrounded by and filled with fluids that are made mostly of water.  OSMOSIS – the diffusion of water through cell membranes  Water is made of up molecules  Pure water has the highest concentration of water molecules, but when you mix something, you lower the concentration of water molecules.
7. 7. Osmosis Continued…  Semipermeable means only certain substances can pass through  If certain substances pass through a semipermeable membrane, over time the water molecules move from the liquid with the high concentration of water to the liquid with low concentration of water molecules.
8. 8. Osmosis Example
9. 9. The Cell and Osmosis The Animal Cell The Plant Cell  Plasma (surrounds red  Osmosis occurs in plant blood cells) is made up of cells water, salts, and sugars.  When a wilted plant is  Concentration of these watered, osmosis makes particles is kept in the plant firm again! balance by osmosis.
10. 10. Hypotonic, Isotonic, & Hypertonic Solution  If environment is:  Hypertonic:  MORE SOLUTES outside cell  MORE WATER IN CELL  over time, cell loses water  Isotonic:  “Iso-” means environment “=” cell  No change in cell volume  Hypotonic:  LESS SOLUTES outside cell  LESS WATER IN CELL, more solutes in cell.  over time, cell gains water
11. 11. Comparison of 3 Types of Solutions HYPERTONIC ISOTONIC HYPOTONIC
12. 12. Moving Small Particles  Small particles, such as sugars, cross the cell membrane through passageways called CHANNELS.  Channels are made up of proteins in the cell membrane.  Particles travel through the channels either through:  Passive Transport  Active Transport
13. 13. Passive Transport Active Transport  Movement of particles across  Process of transporting a cell membrane without the particles that requires use of energy by the cell. the cell to use energy.  Particles move from an area  Usually involves the of high concentration to an area of low concentration. movement of particles  Diffusion and Osmosis are from an area of low examples of Passive concentration to an area Transport! of high concentration!
14. 14. Moving Large Particles  Large particles move into and out of the cell by processes called:  Endocytosis = “Within the Cell”  Exocytosis = “Outside the Cell”
15. 15. Endocytosis  Active transport process that surrounds a large particle.  Encloses the particle in a vesicle.  Brings the particle into the cell.  2 types of endocytosis:  Fagocytosis  Pinocytosis  Receptor-Mediated Endocytosis  What are Vesicles??  Sacs formed from pieces of cell membrane
16. 16. Receptor-Mediated Endocytosis
17. 17. Exocytosis  Active transport which moves large particles out of the cell.  A vesicle forms around a large particle within the cell.  Vesicle carries the particle to the cell membrane.  Vesicle fuses with the cell membrane and releases the particle to the outside of the cell.
18. 18. Quiz . . .  Describe Diffusion!  Describe Osmosis!  What is the difference between active transport and passive transport!  Endocytosis means…?  Exocytosis means…?