Busy. Please wait.
Log in with Clever

show password
Forgot Password?

Don't have an account?  Sign up 
Sign up using Clever

Username is available taken
show password

Make sure to remember your password. If you forget it there is no way for StudyStack to send you a reset link. You would need to create a new account.
Your email address is only used to allow you to reset your password. See our Privacy Policy and Terms of Service.

Already a StudyStack user? Log In

Reset Password
Enter the associated with your account, and we'll email you a link to reset your password.
Didn't know it?
click below
Knew it?
click below
Don't know
Remaining cards (0)
Embed Code - If you would like this activity on your web page, copy the script below and paste it into your web page.

  Normal Size     Small Size show me how

CHCS 7th Ch 4A

CHCS Life Science Chapter 4 (p50-54)

cell membrane a thin covering that forms the outer boundary of a cell
selectively permeable an important characteristic of membranes; certain molecules are allowed to pass through the membrane, while others are not
passive transport the movement of substances through a membrane without the use of the cell's own energy; diffusion and osmosis are types of passive transport
2 types of passive transport diffusion and osmosis
diffusion the movement of molecules from an area of high concentration to an area of low concentration
osmosis the movement of water through a membrane from an area of high concentration to an area of low concentration
Anton von Leeuwnhoek invented the compound microcope; looked at pondwater; called the moving organisms he saw "wee-beasties" or "animalcules"
active transport requires the cell to use its own energy to move substances through a membrane
Created by: mrslisawatson
Popular Biology sets




Use these flashcards to help memorize information. Look at the large card and try to recall what is on the other side. Then click the card to flip it. If you knew the answer, click the green Know box. Otherwise, click the red Don't know box.

When you've placed seven or more cards in the Don't know box, click "retry" to try those cards again.

If you've accidentally put the card in the wrong box, just click on the card to take it out of the box.

You can also use your keyboard to move the cards as follows:

If you are logged in to your account, this website will remember which cards you know and don't know so that they are in the same box the next time you log in.

When you need a break, try one of the other activities listed below the flashcards like Matching, Snowman, or Hungry Bug. Although it may feel like you're playing a game, your brain is still making more connections with the information to help you out.

To see how well you know the information, try the Quiz or Test activity.

Pass complete!
"Know" box contains:
Time elapsed:
restart all cards