If you're seeing this message, it means we're having trouble loading external resources on our website.

If you're behind a web filter, please make sure that the domains *.kastatic.org and *.kasandbox.org are unblocked.

To log in and use all the features of Khan Academy, please enable JavaScript in your browser.

Main content

Course: High school biology > Unit 3

Lesson 3: Passive and active transport

© 2024 Khan AcademyTerms of use Privacy Policy Cookie Notice

Passive transport

Google Classroom

Which of the following answer choices best describes the image above?

(Choice A)
Active transport; energy input; facilitated diffusion; against the concentration gradient
(Choice B)
Passive transport; energy input; simple diffusion; with the concentration gradient
(Choice C)
Passive transport; no energy input; facilitated diffusion; with the concentration gradient
(Choice D)
Passive transport; no energy input; simple diffusion; with the concentration gradient

Related content

Video 8 minutes 6 seconds

Introduction to passive and active transport

Video 1 minute 35 seconds

Passive transport review