I can't tell you if they're planning on adding new content in the areas but I'm sure the KA team will consider your suggestion. 

Thanks for your suggestion!

Admiral Betasin is there somewhere I need to send my suggestion other than posting it here?

There shouldn't be anything else you need to do. If your suggestion is popular enough, they may add your suggested topics. 

L Warden,

Khan Academy does have A&P:

https://www.khanacademy.org/science/health-and-medicine/human-anatomy-and-physiology