hemoglobin
n.a red protein in your blood that carries oxygen from your lungs to the rest of your body. It is what makes your blood look red.
n.a complex iron-containing protein in red blood cells that binds oxygen and transports it through the bloodstream. It is responsible for the characteristic red colour of blood.
“The doctor checked my hemoglobin levels to see if I was anemic.”
“Low hemoglobin levels can lead to fatigue and shortness of breath because the body isn't getting enough oxygen.”
“The structure of hemoglobin allows it to bind oxygen in the lungs and release it in the tissues, making it essential for cellular respiration.”
“For example, hemoglobin A1C levels are used to diagnose and monitor diabetes, cholesterol levels to determine cardiovascular risk, and CT scans to measure the size of a tumor.”
“The exception is the mature red blood cell, which removes them to make space for haemoglobin and improve oxygen transport.”
Originally hematinoglobulin, from hematin (from Ancient Greek αἷμα (haîma, “blood”) + -in) + -o- + globulin (from Latin globus (“ball, sphere”) + -in).
Etymology adapted from Wiktionary, available under CC BY-SA 4.0.