Afferent: Carrying toward. A vein is an afferent vessel because it carries blood from the body toward the heart. The opposite of afferent is efferent. QUESTION The abbreviated term ADHD denotes the condition commonly known as: See Answer From Brain and Nervous System Resources B-Cell Therapy for Multiple SclerosisFighting MS Fatigue With Physical Activity Have You Noticed Problems With Your Memory? Featured Centers Good and Bad Foods for PsoriasisVideo: Getting Personal on Life With MS Health Solutions From Our Sponsors Shot-Free MS Treatment Your Child and COVID-19