Which human cell has no mitochondria?

Mature red blood cells (RBCs) in humans do not have mitochondria. During their development, these cells lose their mitochondria and other organelles to maximize the space available for hemoglobin.

Hemoglobin is the protein responsible for carrying oxygen throughout the body. By lacking mitochondria, red blood cells can carry more oxygen efficiently.

Additionally, the absence of mitochondria prevents RBCs from using the oxygen they transport for their own energy needs, ensuring that oxygen is delivered to other body cells.

This adaptation makes red blood cells highly efficient in performing their function of oxygen transport.