The heart is a hollow muscle that pumps blood throughout the blood vessels by repeated, rhythmic contractions. It is found in all animals with a circulatory system. The term cardiac means "related to the heart" and comes from the Greek καρδιά, kardia, for "heart". The vertebrate heart is principally composed of cardiac muscle and connective tissue. Cardiac muscle is an involuntary striated muscle tissue found only in this organ and responsible for the ability of the heart to pump blood.
All stories in Heart
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The Pentagon's new heartbeat detection laser could save us from our surveillance horror
The Pentagon last week unveiled a long-range laser device capable of detecting a person's unique heart-signature. It was ...
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Researchers create 3D print of heart using harvested human tissue
This is a serious breakthrough
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Apple Watch 4's ECG heart monitor feature is live, here's how to use it
The Apple Watch Series 4's ECG feature can detect issues with how the user's heart is functioning. It is now live for users ...
