Homonym: erection (Construction)
An erection is a physiological process that occurs when blood fills the penis, causing it to become firm and enlarged. This process is typically triggered by sexual arousal, which can be stimulated by physical touch, thoughts, or visual cues. The increased blood flow is facilitated by the relaxation of blood vessels in the area.
During an erection, the corpora cavernosa and corpus spongiosum—two types of erectile tissue—expand and trap blood. This process is controlled by the nervous system and can be influenced by various factors, including hormones, emotions, and overall health. Erection is a normal part of male sexual function.