Attention can be kept focussed on a single point in the respiratory tract.

What is infection and its effect on the respiratory tract?

Running or increased cardiovascular activity can help clear the respiratory tract.

"And is it supposed to be inhaled into the respiratory tract?"

The team has found that cats can be infected through the respiratory tract.

It can have acute health effects on behavior, respiratory tract and nervous system.

It is one of several bacteria normally present in the respiratory tract.

It can also damage the skin and upper respiratory tract.

The lungs are the biggest organ in the lower respiratory tract.

But the evidence shows that bacteria in the respiratory tract aren't playing much of a role, if any at all.