Refer to the Teacher and Class tables. The action ON UPDATE SET NULL is specified for the TeacherID foreign key. What is the result when Bryan McNeal’s TeacherID is changed to 45672?  

The respiratory system contains a total of five __________________.

There are three lobes of the left lung and two lobes of the right lung separated by the mediastinum.

The ____________ helps to retain food in the mouth until it is ready to be swallowed.

Air that enters the respiratory system fills the conducting zone, which results in a complete gas exchange.

_________________ is a deficiency of oxygen or the inability to utilize oxygen in a tissue.

The upper respiratory tract extends from the nose down to the __________________.

___________________________________ epithelial tissue lines the surfaces of the trachea, bronchus, and bronchioles of the respiratory tract.

Aldosterone promotes potassium excretion.

The pleura lines the wall of the thoracic cavity and consists of the visceral and parietal pleura.