You are called to evaluate an ill child. The mother states that the child was fine a few hours ago but now is exhibiting, dysphonia, drooling, dysphagia, and distress. You suspect:

A check valve is used to prevent _______ for safety reasons and to ensure that the water flows in the system in only one direction

a. backflow b. pressure relief c. accidental discharge d. low pressure

What is the causative mechanism and the structure(s) involved in "Nursemaid's elbow"?

What will be an ideal response?