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In the larynx, the ____________________ cartilage sits atop and is anchored to the trachea.

In the trachea, cilia and goblet cells are found in the _________________________ layer.

________________________ refers to the air that fills respiratory passageways but never contributes to gas exchange in the alveoli.

Most gas movements associated with the respiratory system occur via _____________________________.

Which of the following best illustrates the flow of air from the nasal cavity to the larynx?

Every hemoglobin molecule has the ability to carry _____________________________ oxygen molecules.

The _____________________ tonsils occur in pairs and are located at the posterior end of the oral cavity.

Much of the dust and debris that enters the body during inspiration never reaches the lungs. Why is this so?

Which of the following statements is true of lymphatic collecting vessels?

The Major Histocompatability Complex (MHC) plays a key role in: