Dementia pt aspirated. if he drinks water he chokes. why is this happening? is the choking related to the dementia or a physical organ problem?

In order to speak...: humans evolved unusual throat anatomy: The entrance to our windpipe is much closer to our mouth than other mammals'. To keep food etc from getting into our lungs, a muscular flap closes over it when we swallow. Deglutition is a very complex, highly coordinated motor reflex. In dementia, control of this crucial motor task is often impaired. We use our brains to do more than just think.