Area of the brainstem involved with regulating respiration.
Respiratory Bronchiole
Subdivision of bronchi in which exchange of gases takes place.
Respiration
The movement of air in and out of the lungs and the exchange of gases.
Resistance Vessel
Blood vessel that provides greatest resistance to the flow of blood.
Residual Volume
The volume of air that remains in the lungs after forced expiration.
Reproductive System
System responsible for the propagation of a species.
Repressor gene
Gene that opposes cell division.
Repolarization
The process following depolarization, in which the inside of a cell becomes more negative, to reach the resting membrane potential; caused by changes in ion movement.