Which structure acts as traffic police in the above passage? hi friends please answer to this question with the help of give passage in the pic I posted above.. please help me guys..

epiglottis

Explanation:

let me give you an activity swallow saliva and see if you breath

a traffic police stops traffic from one end to let traffic on another end pass

this is what it does when you swallow the epiglottis partially closes the trachea to prevent entry of food and opens after swallowing and therefore acts as a traffic police

1. dermis

2. chemical

3. urine

4. viruses

5. antibodies