A stent is a small metal or plastic tube that has a mesh like pattern. It is placed in blocked or narrowed arteries that are obstructing blood flow. The stent then keeps the artery open which allows the blood...

RER, short for Respiratory Exchange Ratio is a ratio that aims to measure the amount of carbon dioxide (CO2) produced in comparison to the amount of oxygen (O2) used. The Respiratory Quotient (RQ), also known...

A therapist, or officially a psychotherapist is anyone who offers psychotherapy as part of their services. A psychiatrist is a doctor with a medical degree specializing in psychiatry.

A birth defect is a condition that exists when a baby is born. It can occur at the time of the birth itself, or before birth, in the womb. A mutation is a type of birth defect. It is a change in the DNA...

Cancer cells acquire a mutation in their structure and develop the ability to divide and grow uncontrollably without dying, creating tumors. A normal cell is a cell that has predetermined structure. They...