Access to medical services in the united states depends on what three factors

Access to medical services means that you use health and medical services periodically in order to be having the best outcomes of health.

This access requires 3 important steps or factors which are:
1- To gain an entry permission to a health-care system. You can usually achieve this by using an insurance coverage
2- To gain access to the specified locations/departments that provide you with the needed health services or checks
3- To build a trustworthy relationship with a health-care provider

Dairy, grains, protein, fruits, vegetables

It's called the nephron.