Active and Passive Transport 7th grade science

Have you ever ridden a bicycle down a long hill Have you ever ridden a bicycle down a long hill? Does it take a lot of energy to go fast? What about riding a bike uphill? Does it take a lot of energy to go fast? For a cell, moving materials through the cell membrane through diffusion and osmosis is a lot like riding a bike downhill

Passive Transport – is the movement of dissolved materials through a cell membrane without using cellular energy – like riding a bike downhill 2 Methods of Passive Transport: Osmosis

2. Diffusion

Active Transport – is the movement of materials through a cell membrane using cellular energy – like riding a bike uphill Transport Proteins – these proteins “pick up” molecules outside the cell and carry them in, using energy – ex: calcium, potassium, sodium

Transport by Engulfing – the cell membrane surrounds and engulfs, or encloses, a particle. Once the particle is engulfed, the cell membrane wraps around the particle and forms a vacuole within the cell **Active transport requires the cell to use its own energy, while passive transport does not!**