Around how many overdose deaths occurred in 2019 in America?

Describe the overall function of the nervous system

Insulin is a peptide therapeutic used to manage type 1 diabetes, which affects more than 20 million people worldwide according to the international diabetes federation. a significant limitation to the broad distribution and use of insulin to treat type 1 diabetes is the fact that it must be administered by injection rather than orally. why is insulin administered by injection and not orally?

In this model, what do p, s, and a bases represent?