'When these need to be replaced, it's generally the ones on the left side of the heart, where the pressure's higher'
a valve
THE HEART: When these need to be replaced, its generally the ones on the left side of the heart, where the pressures higher
When these need to be replaced, it's generally the ones on the left side of the heart, where the pressure's higher
When these need to be replaced, it's generally the ones on the left side of the heart, where the pressure's higher
THE HEART
a valve
THE HEART