Day and night, the muscles of your heart contract and relax to pump blood throughout your body. When blood returns to the heart, it follows a complicated pathway. If you were in the bloodstream ...

the human heart will beat more than 2.5 billion times. Give a tennis ball a good, hard squeeze. You're using about the same amount of force your heart uses to pump blood out to the body.

It also shows how the pacemaker cells restart her heart after the surgery. This short film is from the BBC series, Inside the Human Body. The 3D footage brings the topic to life and would enhance ...

Researchers studied samples of human brains and found high levels of microplastics, but it's unclear how they slip past the ...

British cardiac patients will soon be fitted with heart valves ... pigs or human tissue and implanted in the patient only last a decade or so and can still be rejected by the body’s immune ...