The biomaterial used to design artificial vascular grafts1 pointPolystyrenePolymethylmethacrylatePolyurethanePolypropylene

The biomaterial commonly used to design artificial vascular grafts is Polyurethane.

Here's a step-by-step explanation:

1. Biomaterials are materials that are used in contact with biological systems for medical purposes. They must be compatible with the body and not cause any adverse reactions.

2. Artificial vascular grafts are used to replace damaged or diseased blood vessels. They need to be flexible and durable, and also biocompatible.

3. Polystyrene, Polymethylmethacrylate, and Polypropylene are all types of plastics, but they are not typically used for vascular grafts.

4. Polyurethane, on the other hand, has the right properties for this application. It is flexible and durable, and it has good biocompatibility. It is also easy to work with and can be made into a variety of shapes and sizes.

5. Therefore, Polyurethane is the biomaterial used to design artificial vascular grafts.