BRAINPOP: PASSIVE TRANSPORT NAME: ___________________________ ________________________ get everything they need from their ________________________. The ________________________in your body hang out in an ________________________of ________________________, which contains ________________________, ________________________, ________________________, and whatever else they might need to ________________________. How does stuff get in and out of cells? Well, cells are surrounded by ________________________ ________________________. But the ________________________are selectively ________________________— they let ________________________things in and ________________________ others out. The ________________________have tiny ________________________in them pores that allow certain ________________________, like ________________________and ________________________, to pass through. These ________________________can move through the ________________________without the use of ________________________on the cell’s part. This movement is called ________________________ transport — the cell doesn’t have to do anything to make it happen. It just sits there and lets the ________________________, ________________________, and whatever else ________________________through. Now, ________________________ ________________________ works by ________________________. That’s the natural ________________________of ________________________through a liquid or ________________________. ________________________ naturally ________________________from high ________________________areas to ________________________concentration areas. These ________________________in concentration are called ________________________. If you’ve ever smelled flowers from across a room, you’ve ________________________the effects of ________________________. How does ________________________relate to our ________________________? Okay, let’s say there are more ________________________molecules outside a ___________________ than inside. Because ________________________can pass through a cell ________________________, ________________________ will even out the ________________________of oxygen ________________________inside and ________________________the ________________________. That’s how our ________________________get the oxygen and ________________________they need to ________________________. ________________________actually works for getting ________________________of ________________________, too. As ________________________ ________________________ builds up inside a cell, it ________________________through the ________________________and into the surrounding ________________________, which has a lower C O 2 ________________________. Healthy cells ________________________a state of dynamic ________________________ — substances are constantly ________________________across cell ________________________to even out the ________________________. Sometimes a cell will move ________________________up the ________________________ gradient. And food ________________________, like ________________________, are too big to get through the ________________________in the cell ________________________. When a ________________________has to use ________________________to move ________________________across its _________________, it’s called active ________________________. REVIEW QUIZ: Write the letter AND full answer in order to get full credit. 1. Where do cells get the oxygen, water, and nutrients they need to function? ____ ____________________________________________________________________________ 2. Cell membranes are selectively permeable. What does "permeable" mean? ____ ____________________________________________________________________________ 3. What might happen if cell membranes did not have pores? ____ ___________________________________________________________________________ 4. Which of the following is an example of diffusion? ____ ___________________________________________________________________________ 5. Which of the following describes a state of equilibrium? ____ ___________________________________________________________________________ 6. In what direction do particles naturally diffuse? ____ ___________________________________________________________________________ 7. From the information presented in the movie, what can you infer about carbon dioxide? ____ ___________________________________________________________________________ 8. When substances are constantly moving back and forth across a cell membrane, the cell is said to be in a state of: ____ ___________________________________________________________________________ 9. What is the main difference between active transport and passive transport? ____ ___________________________________________________________________________ 10. Which of the following is a true statement about passive transport? ____ ___________________________________________________________________________
