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The __________ serves as a center for receiving and integrating sensory input and sending nerve impulses to another respiratory center to make necessary changes in the breathing pattern.

Much of the mucus in the mouth comes from the _____________ salivary gland under the tongue.

The exchange of oxygen and carbon dioxide between air in pulmonary alveoli and blood in capillaries occurs by ______.

Platelets are produced from cells called ______.

The respiratory centers are located in the ______.

Quiet expiration requires the ______.

___________ play an important role in regulating the airflow through the air passageways.

The inhaled air enters each lung lobe through a ______.

The systemic circuit carries _________ blood from the _________ to all parts of the body except the lungs and returns _________ blood to the _________.

When _____________, blood pressure within the ventricles increases, which causes the AV valves to close and the semilunar valves to open.