Online College Courses for Credit

Bill Nye: Go with the flow

Bill Nye: Go with the flow

Author: Bill Nye

This tutorial from Bill Nye shows how much energy your heart has to expend to pump blood, and demonstrates that it's easier to pump blood downward.

See More
Fast, Free College Credit

Developing Effective Teams

Let's Ride
*No strings attached. This college course is 100% free and is worth 1 semester credit.

37 Sophia partners guarantee credit transfer.

299 Institutions have accepted or given pre-approval for credit transfer.

* The American Council on Education's College Credit Recommendation Service (ACE Credit®) has evaluated and recommended college credit for 33 of Sophia’s online courses. Many different colleges and universities consider ACE CREDIT recommendations in determining the applicability to their course and degree programs.


Go with the Flow

From your feet to your brain and all points in between, your heart has a tough job circulating blood all through your body. It’s easy to imagine how blood flows to your feet. It goes down hill. Gravity pulls everything down, including your blood. The only way blood gets up from your feet or out to your hands is from the pumping of your heart. And it works hard. Just try lifting a bucket of water sometime. It’s heavy, and so is your blood. Your heart has to pump your blood all day, every day.

See how hard your HEART has to work!

What You Need:

1. your hands

What You Do:

1. Hold one hand straight up over your head, and let the other one hang down at your side. 
2. Slowly count to sixty. 
3. Now hold your hands side by side and look them over.

What’s Happening?

See how the hand that was up in the air is much paler than the one that was hanging down? That’s because gravity made it harder for your heart to pump blood to the hand over your head, but it helped your heart to pump blood to the hand that was hanging down. The more blood, the darker your hand. Blood flowing can get science going!

Go with the flow