of course ..heart never rest

Heart beat every second of life, and once stop! Life of the being ceased.....

(D) Brain...

Poor heart

Heart , after heart stop working all above no more in action ,, ,,,moreover brain dead's heart continue work

Lol, Do you also know that Your brain is your eyes and without it you can do anything. it is the brain that tells your heart what to do, like your feelings, actions etc. Heart is like engine or a power house but Brain is like wires and things that made the heart lol. this question is a bit crazy to answer

Eyes rest when you sleep. Nose rests too because you cant smell odours while sleeping The brain too enters a sub concious mode while sleeping that's when we dream. The answer is heart....lol ...not brain

No organ of the human body takes complete rest durin our lives. We can fall asleep or sit n give our muscles some rest but they never stop working n functioning.

Its brain