: Mature red blood cells lack a nucleus and most organelles (like mitochondria) to maximize space for hemoglobin, the protein that carries oxygen.
: As these cells age, signals on their surface trigger their removal from the bloodstream by the spleen and liver. Other Related Contexts mature red
: In ultrasound Doppler flow studies, red color on the display typically indicates blood flowing toward the ultrasound transducer, which doctors use to evaluate blood flow in a post-term (mature) fetus. : Mature red blood cells lack a nucleus
: Immediately after birth, a woman experiences "lochia rubra," which is bright red vaginal bleeding that typically lasts for the first 3–4 days. a woman experiences "lochia rubra
