Tetanus requires hospitalization, treatment with human tetanus immune globulin (TIG), a tetanus toxoid booster, agents to control muscle spasm, aggressive wound care, and antibiotics. Metronidazole is the most appropriate antibiotic. The wound should be debrided widely and excised if possible.
Chemistry is also a physical science, and could be seen as a bridge between physical and life sciences. Chemical reactions happen in lifeforms like humans constantly, as studied in biochemistry, so understanding chemistry naturally leads to a better understanding of living organisms.
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.