How Does the Human Heart Work?
Your heart is a muscular pump that moves blood around your body non-stop. Learn about its chambers, valves and the electrical system that keeps it beating.
Medicine
Articles, guides and definitions about Medicine — part of Health & Wellness on Worldlession.
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Articles in Medicine (2)
How Do Vaccines Work?
Vaccines train your immune system to recognize and fight diseases before you encounter them. Learn how they work and why they matter for public health.
Frequently asked questions
How big is the human heart?
About the size of a clenched fist, though it varies with body size. Despite its small size, its muscular walls generate enough force to circulate blood throughout the entire body.
Can a vaccine give you the disease it prevents?
Licensed vaccines cannot cause the disease they protect against. Inactivated, subunit and mRNA vaccines contain no live germ at all, and live-attenuated vaccines use germs weakened so they cannot cause illness in people with healthy immune systems.