Tell me what's hard and soft in your heart.

As for the soft things in my heart, I cast my heart valve. In addition to the integrity of the valve system, the moderate flexibility and elasticity of the valve is an important part of performing its one-way valve function. 100,000 times a day, every time the valve is opened, it should be pushed away by proper blood pressure, so as not to obstruct this blood flow as much as possible, and every time it is closed, it should be sutured quickly and decisively. In some valve diseases, such as rheumatic heart disease, the original soft and elastic tissue is replaced by calcified scar tissue after repeated valve injuries. When blood pressure comes over, the opened valve cannot be completely opened in time, and the closed valve cannot be sealed to prevent blood from flowing back. The heart needs to exert more contraction force and contain more blood that should not be contained in order to maintain the normal operation of the body. All this is caused by the rigidity of something that should be soft. Another interesting thing is that one of the ways to solve this stiff problem is to replace the seriously damaged original goods with the hard but exquisite artificial valves mentioned above.