stackyFACTS
Science

Earthworms have five pairs of hearts

HERE’S THE INTERESTING PART

It takes an extraordinary amount of cardiovascular effort to blindly tunnel through dirt all day. Earthworms have five pairs of aortic arches tucked closely to their heads. While they don't look like human hearts, these pseudo-hearts perform the exact same essential function, rigorously squeezing blood through their squishy, entirely brainless systems.

From the Stacky collection1 min read
Earthworms have five pairs of hearts
STACKY / Science
Topics in this factanatomyearthwormsbiology
One discovery leads to another.

Keep exploring facts in this topic.

Science →
STACKY FOR IPHONE

A bigger world.
One discovery
at a time.

Keep discovering with Stacky. Interesting facts in an app that is always within reach.

Download on the App Store
ONE MORE DISCOVERY?

Keep exploring

All in this topic →
Why your heart ends up on the left
Science

Why your heart ends up on the left

The only reason your heart is on the left side of your chest is because of millions of microscopic, spinning biological windshield wipers. During early…

Discover more
Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?
Science

Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?

Why does stubbing your toe predictably generate a second, deeply agonizing wave of pain a few seconds after the initial impact?

Discover more
What’s the slightly terrifying biological reason your tattoos don’t just naturally heal and disappear over time?
Science

What’s the slightly terrifying biological reason your tattoos don’t just naturally heal and disappear over time?

What’s the slightly terrifying biological reason your tattoos don’t just naturally heal and disappear over time?

Discover more
If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?
Science

If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?

If the blood rushing through your healthy body is always red, why do the veins in your wrist look distinctly blue?

Discover more
Despite making up only two percent of your total body weight, how much of your daily energy does your brain consume?
Science

Despite making up only two percent of your total body weight, how much of your daily energy does your brain consume?

Despite making up only two percent of your total body weight, how much of your daily energy does your brain consume?

Discover more
Which incredibly vital part of the human body has zero blood vessels and must pull oxygen directly from the air?
Science

Which incredibly vital part of the human body has zero blood vessels and must pull oxygen directly from the air?

Which incredibly vital part of the human body has zero blood vessels and must pull oxygen directly from the air?

Discover more
StackyMore discoveries in the app
Download on the App Store