All of the following are true of the trachea except

External respiration requires a higher oxygen concentration in the _____ than in the _____.

Which of the following is one of the end products of fat digestion?

Most fat digestion occurs in which organ?

The exchange of gases between the lungs and the blood is called

The largest of the salivary glands is the _____ gland.

The two phases of pulmonary ventilation are

Poison ivy reactions are an example of a(n) _____ condition.

If you are exposed to hepatitis A and have not been vaccinated against it, you may receive antibodies from another person. This is an example of _____ immunity.

After birth, B cells transform from stem cells to immature B cells in