Untreated clinical depression is a serious problem. Untreated depression increases the chance of risky behaviors such as drug or alcohol addiction. It also can ruin relationships, cause problems at ...

Share on Pinterest Research shows that Alzheimer’s disease affects many organs beyond the nervous system. Nisian Hughes/Getty Images Alzheimer’s is characterized by a buildup of proteins in the brain, ...

“I view affect as the primary innate biological motivating mechanism, more urgent than drive, deprivation, and pleasure, and more urgent even than physical pain ...

Rheumatoid arthritis affects various parts of the body beyond the joints, including the skin, eyes, lungs, heart, and even the brain. In the bones and joints, it can cause pain, swelling, bone damage, ...

Multiple sclerosis causes a breakdown of the protective cover around nerves in the brain and spinal cord. This can affect various body systems, resulting in difficulties with thinking, vision, mood, ...

Heavy use of MDMA (ecstasy) may lead to long-term changes in your brain’s serotonin system — but there’s a lot we still don’t know. MDMA, also known as ecstasy or Molly, is a synthetic psychoactive ...

“The critical point is that the human being has evolved as a multimechanism system in which each mechanism is at once incomplete but essential to the functioning of the system as a whole.” –Silvan S.

Note: This video is designed to help the teacher better understand the lesson and is NOT intended to be shown to students. It includes observations and conclusions that students are meant to make on ...