What is not a function of platelets?

Platelets, or thrombocytes, are critical components of the blood that play essential roles primarily in clot formation and the body's response to injury. Their primary functions include aggregating at the site of a blood vessel injury, releasing chemical signals to attract more platelets, and forming a temporary plug to stop bleeding. They are also involved in the healing process through released growth factors.

Oxygen transport is primarily the function of red blood cells, which contain hemoglobin that binds to oxygen in the lungs and delivers it to tissues throughout the body. This distinction is key, as platelets do not have the ability to transport oxygen. They have a completely different role when it comes to maintaining hemostasis and supporting wound healing, which is why this option is accurately identified as not being a function of platelets. Additionally, while platelets may play a minor role in the immune response through their interaction with other immune cells, this is not their primary function.