The basic Celtic Cross is a symbol comprising a conventional cross with a ring around the intersection of the stem and the arms (as per the more elaborate example above).
Biomedical science includes any course of scientific study related to biology as it affects health care. It includes classes such as physiology, anatomy, epidemiology, biochemistry, nutrition and kinesiology. Biomedical sciences are the foundation of knowledge for all health care professionals.
Physical science is basically an umbrella term for the natural sciences that don't deal with living things or systems. We generally contrast physical science with the biological sciences. As we look at the sciences, we see many fields, such as biochemistry, where the biological and the physical sciences overlap.