Ribonucleic Acid.
Rickets
A disease in children caused by a vitamin-d deficiency and characterized by softening and bending of bone.
Ribosome
Tiny organelle in the cytoplasm that manufacture proteins.
Ribonucleic Acid (RNA)
Important for storing and processing information for the cell.
Rhythm Method
A natural contraceptive method in which intercourse is avoided during the fertile period.
Rh-Positive
When and individual’s red blood cell membrane does has the Rh antigen
Rh-Negative
When and individual’s red blood cell membrane does not have the Rh antigen
Rh Factor
A special antigen (Rhesus antigen) found on the surface of red blood cells of individuals who are Rh-positive.