The most sensitive areas of the air passages are located in the

Carbon dioxide is sometimes added to the air that a patient breathes in order to

The units of heat that measure the amount of energy in food are called calories.

When carbon dioxide bonds to hemoglobin, the compound carbaminohemoglobin is formed.

During urine formation, some substances move from the plasma in the peritubular capillary into the renal tubule by the process called _____.

Vitamin B can be synthesized from a sterol in the skin.

The pitch of a vocal sound is controlled by changing the

The basic food group that supplies the best source of vitamin C is

The mucous membrane lining the nasal cavity functions to

Increasing blood concentrations of carbon dioxide and hydrogen ions have similar effects upon the respiratory center due to