蜜芽传媒

Open heart surgery appears to be safer in the afternoon because of the body's internal clock, scientists have said.

John O'Neill is from the Medical Research Council's Laboratory of Molecular Biology in Cambridge. He told Sarah Montague that the body clock anticipates demand according to the time of day.

"In your heart cells your anticipated demand is greatest in the afternoon," he said.

(Image: Surgery. Credit: Getty Images)