The heart is a hollow, muscular organ that maintains blood circulation throughout the body. Learn how the circulatory system - your heart, blood vessels and blood - bring nutrients to the body.
How White Matter Helps the Brain's Gray Matter Function
Bruce Willis Has Aphasia. What Is It and What Causes It?
Can Our Bodies 'Learn' to Withstand Frigid Temperatures?
The World's Longest Poop Story Is a Crock of, Well ...
When You Have to Go But Don't Want People to Know
Farts Can Be Silent, But Can They Be Deadly, Too?
Does Oxytocin Make Us Fall in Love?
5 Ways Homeostasis Keeps Your Body Humming Along
Is It Possible to Get Taller as an Adult?
Why Do Babies' Eyes Change Color?
There Are 6 Different Eye Shapes. Which One Is Yours?
Self-navigating Cane Could Better Lives for Visually Impaired
What Do Your COVID-19 Vaccine Side Effects Tell You?
What You Should Know About Antibody Testing
Cytokine Storms: When Your Immune System Defends You to Death
Kidney Stones Are Excruciating, But the Source of Pain Is Surprising
Why Do We Do a Little Dance When We Have to Pee?
Do You Turn the Door Key and Have to Pee? It May Be All in Your Brain
The Lymph System
What is lymph?
How One Key Protein May Help Tendons Enhance Athletic Performance
What Are Muscle 'Knots' and How Do You Get Rid of Them?
Take Care of Those Hammies
The Science Behind Why We All Have Snot
The Flu Was Nonexistent During COVID. What Does That Mean?
Why Breathing Through Your Nose Is Best
A low oxygen level in your blood is a good indicator of a COVID-19 infection, but what exactly does that mean and how do doctors test for it?
James Harrison's blood contains a rare and powerful antibody that's saved millions of Australian babies. Now, at age 81, after donating 1,173 times, he's hoping someone else will pick up where he left off.
The heart is crucial to life and the focus of love. Explore the parts of the heart and how your heart works, plus take a look at real pictures of human hearts with this gallery.
When you donate blood, your blood type is an important factor in how useful your donation may be. Just what are blood types?