Final answer:
The large plasma protein that is used as a transport protein for lipids and heavy metal ions is albumin.
Step-by-step explanation:
The large plasma protein that is used as a transport protein for lipids and heavy metal ions is albumin. Albumin is produced by the liver and plays a crucial role in transporting fatty acids, steroid hormones, and heavy metal ions across the blood. It also contributes to osmotic pressure and acts as a buffer.