The correct answer is option 2: 1,00,000 times. Our heart valves open and close normally around 1,00,000 times each day. Heart valves are responsible for ensuring that blood flows in only one direction through the heart chambers. There are four valves in the human heart: the tricuspid valve, pulmonary valve, mitral valve, and aortic valve. These valves constantly open and close as the heart beats, allowing blood to pass through the chambers and then preventing it from flowing backward. Over the course of a day, the heart undergoes multiple cycles of contraction and relaxation, resulting in the opening and closing of the valves. This continuous opening and closing process ensures efficient blood circulation throughout the body.