About 23% of the CO2 in the blood is transportedas ______.

The auditory tubes open into the ______.

___________ results from long-term exposure to airborne irritants; is characterized by a rupture of the pulmonary alveoli, forming large spaces in the lungs.

The end products of protein digestion are ________, which are absorbed into ________ of villi.

The part of the respiratory system with the largest internal surface area is the ___________.

The QRS complex of an ECG is produced by the ______.

The primary function of the large intestine is the __________.

Which of the following is the correct pathway of the electrical impulses of the conducting system of the heart?

Lymph is filtered and cleansed by the ________ before it is returned to the blood.

A complete blood cell count that reveals an unusually high number of WBCs might indicate ________.