Below is an instruction from Human. Write a response.
    ### Instruction:
    What is (are) Congenital Heart Defects ?
    ### Response:
    Congenital (kon-JEN-ih-tal) heart defects are problems with the heart's structure that are present at birth. These defects can involve:
                
The interior walls of the heart
                
The valves inside the heart
                
The arteries and veins that carry blood to the heart or the body

    