Which type of blood cells have a larger surface area for gas transport and lack nuclei?

Erythrocytes, commonly known as red blood cells, are the type of blood cells that possess a larger surface area for gas transport and are characterized by the absence of nuclei. Their unique biconcave disc shape enhances their surface area, allowing for more efficient diffusion of oxygen and carbon dioxide. The lack of a nucleus allows more room for hemoglobin, the protein responsible for binding and carrying oxygen, contributing to their primary function in oxygen transport throughout the body.

In contrast, platelets are involved in blood clotting, while leukocytes (white blood cells) play a crucial role in the immune response and do contain nuclei. Agranulocytes, a specific category of leukocytes, also have nuclei and are involved in various aspects of immune function. Thus, erythrocytes stand out due to their structure and specialization for gas exchange.