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Powerpoint  Metabolisme 1
 

Powerpoint Metabolisme 1

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Powerpoint Bab Metabolisme (Engiish Edition)

Powerpoint Bab Metabolisme (Engiish Edition)

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

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    Powerpoint  Metabolisme 1 Powerpoint Metabolisme 1 Presentation Transcript

    • The Cell in Action!!! STATE UNIVERSITY OF SURABAYA By: Ms. Dhita
    • 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
    • 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.
    • 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
    • Example of Diffusion
    • 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.
    • 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.
    • Osmosis Example
    • 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.
    • 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
    • Comparison of 3 Types of Solutions HYPERTONIC ISOTONIC HYPOTONIC
    • 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
    • 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!
    • Moving Large Particles  Large particles move into and out of the cell by processes called:  Endocytosis = “Within the Cell”  Exocytosis = “Outside the Cell”
    • 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
    • Receptor-Mediated Endocytosis
    • 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.
    • Quiz . . .  Describe Diffusion!  Describe Osmosis!  What is the difference between active transport and passive transport!  Endocytosis means…?  Exocytosis means…?