Active transport uses energy in the form of ATP. The video explains three types of active transport. It begins with membrane pumps before discussing endocytosis and exocytosis.

Care to speculate on how life on Earth came to be? The video presentation from the ACS Reaction series considers the possibility of comets creating the right conditions for the formation of life. Scholars consider colliding comets as...

The Industrial Revolution changed transportation systems, social systems, and economies. Episode 21 of Crash Course History of Science examines the Industrial Revolution. From the invention and improvements to the steam engine to the...

Starting with a diagram of a concrete example of electrophilic aromatic substitution, this video recaps diagrams of the electrophile behavior and how they "attack" relatively stable carbocations.

Helium is the second most common element in the universe, yet we are running out of helium on Earth. A video on this important element includes common reactions, uses, and concerns that scholars need to know to understand helium.

Blood passes through the kidneys about 300 times a day. Show your class how the kidney and bladder work together to filter blood in the excretory system. This 19th video in the series explores how the circulatory and respiratory systems...

Explore trees' strategies for surviving winters in cold climates. The first trees were built for tropical climates. As they migrated to colder climates, they adapted the capability to survive the harsher weather. The video lesson...

Mike and Kellie, a team of electrical engineers, demonstrate how to to design a contraption that accurately drops a marble onto a target. The materials needed and general instructions are provided on the website or via a downloadable...

This lesson introduces the process of active transport, explaining that it is a form of transport that requires energy, and moves molecules against their concentration gradient. It is 3 of 4 in the series titled "Active Transport."

This lesson will give an overview of process of cellular respiration which produces cellular energy in the form of ATP. It is 1 of 2 in the series titled "Overview of ATP Production."

Video tutorial presents a review of various forms of passive and active transport. [7:12]

This lesson explains the process of diffusion. It explains how diffusion is a passive form of transport, used to move molecules down their concentration gradient. It is 3 of 8 in the series titled "Diffusion."

This lesson explains the process of osmosis. It explains how osmosis is a passive form of transport, used to move water molecules across a semi-permeable membrane, down their concentration gradient. It is 3 of 8 in the series titled...

In this episode of Crash Course Kids, Sabrina gives us a real world example of how the Hydrosphere and Geosphere affect each other in the form of Weathering and Erosion. Think of Weathering as the force that makes a mess and Erosion as...

Kids Invent Stuff is the YouTube channel where 5-11-year-olds have the chance to get their invention ideas built by real engineers. Kids are encouraged to submit their ideas for inventions to solve a different challenge each month. One...

How do the valleys form in a basin-range province? [0:33]