Well, The Doctor is from a race of aliens called Time Lords. A Time Lord possesses a binary vascular system, meaning that The Doctor's body is optimized to run on the extra strength and endurance that two hearts can give (hence the reason he can do things like run for a long time without getting tired).
Interestingly enough, in the episode 'The Shakespeare Code', the Doctor had one heart go out on him for a brief period of time. Instead of functioning at normal human capacities during that time, showed extreme weakness and pain. This suggests that the two different hearts, instead of supplying equal amounts of blood to the entire body, have different primary functions.
So, that's the long, sciencey, geeky answer. If you want the short answer-He's an alien. It's no wonder some of his internal workings are different than ours.
Two Hearts in Harmony - 1935 is rated/received certificates of: UK:A
Two Hearts in Waltz Time - 1934 is rated/received certificates of: UK:U
Highlander - 1992 Two of Hearts 6-10 is rated/received certificates of: Argentina:13
Two Tender Hearts and the Heist - 2013 was released on: USA: 15 September 2013 (Sacramento Film and Music Festival)
tap and hold a Pokemon if it likes you a bit it will have a small blinking heart if it likes you more it has two blinking hearts if it likes you ALOT it has two huge hearts
The Time Lord known as the Doctor from the TV show Doctor Who has two hearts.
Doctor Who has two hearts (harts refers to deer, Doctor Who has no deer)- it is a characteristic of Time Lords.
Look to Doctor Who he has 2 hearts
Anyone with two hearts and a TARDIS
The phrase "Time Lord" is just a rank given to people on Gallifrey. Gallifreyans, however, have two hearts.
he had loads of brothers and sisters, Doctor Who is one of them. He is my best friend and has two hearts
A starfish has two hearts . A starfish has two hearts .
Cardiology is the study of hearts, so a cardiologist would be a doctor who deals with hearts.
No, though i wish i was. The Doctor is a Time Lord who is also a Gallifreyian from the plant called Gallifrey. He looks like us but has two hearts and has the ability to regenerate if hurt.
Cardiologists.
Two Hearts..
In the physical sense, no. But, in the figurative sense, yes. One to support his body, one to support his writing.