The nasal cavity is separated from the oral cavity by:

The lymphatic vessels and cardiovascular veins are similar in that they operate under low pressure and some larger ones have valves.

The lungs are housed in the mediastinum of the thoracic cavity.

Expiration occurs when the thoracic and intrapulmonary volumes decrease and the intrapulmonary pressure increases.

Changes in oxygen levels in the blood are the most important stimuli for breathing in a healthy person.

Which one of the following is NOT true of inspiration:

Where are the respiratory centers housed which control involuntary breathing rates:

Changes in oxygen levels in the blood are the most important stimuli for breathing in a healthy person.

The nasal cavity is separated from the oral cavity by the nasal conchae.

_____ – carry lymph from peripheral tissues to the venous system