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Injured cells release chemicals such as histamine and kinins that dilate vessels, attract phagocytes and activate pain receptors.

The nasal cavity is separated from the oral cavity by:

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

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

Antigen presentation is essential for the activation of clonal selection of T cells.

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.

What is the role of mucus in the nasal cavity:

Which one of the following is NOT true of inspiration:

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