Cells Part 2

Exchanges Between the Cell & Its Environment 4 types : Diffusion Osmosis Photosynthesis Cellular Respiration https://www.youtube.com/watch?v=aubZU0iWtgI

Words to Remember from the Video Solute Solvent Diffusion Equilibrium Osmosis Semi-permeable membrane High/ Low concentration

Diffusion Diffusion is the process by which molecules spread from areas of high concentration, to areas of low concentration. When the molecules are even throughout a space - it is called EQUILIBRIUM

In other words… Diffusion is the movement of SOLUTE from a HIGH concentration to a LOW concentration. EQUILIBRIUM HIGH LOW

Osmosis Osmosis is the passage of water across a membrane that only allows certain substances to pass http://www.youtube.com/watch?v=DVsmtCgXtU0

Osmosis cont. The solute is more concentrated on the right side to start with. This causes molecules to move across the membrane toward the left until equilibrium is reached. Selectively Permeable Membranes allow some things across the membrane. For example water and oxygen move freely across the cell's membrane, by diffusion

Words to Remember from the Video Solute Solvent Diffusion Equilibrium Osmosis Semi-permeable membrane High/ Low concentration

Photosynthesis Definition Def: Production of oxygen and sugar from solar energy, water and carbon dioxide Needs: chloroplast Equation: Solar Energy + water + CO2  Oxygen + glucose

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Cellular Repiration Definition Def: Production of energy, water and carbon dioxide from oxygen and sugar. Needs: mitochondria Equation: Oxygen + glucose  CO2 + water + energy

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How Photosynthesis & Cellular Respiration Relate

Microscope

Microscope