Creating A BP Blog Author Bio Box

Is it just me, or is there no Buddypress function reference? I can't seem to find one and it's a real drag because what I want to do is simple:

I'm using the Blogs MU theme, and am creating a child theme for member blogs (for sitewide visual consistency). In the sidebar of this child theme, I'm creating a bio box for the blog owner.

I managed to randomly stumble across the get_avatar(get_the_author_id()) function, which displays the thumbnail version of the blog owner's avatar perfectly. Adding a second parameter for size scales the thumbnail up, but does not display the unscaled full-sized version of the avatar. How do I retrieve the full-sized avatar?

Also, I have a BP profile field set up for users to enter a bio for themselves. There must be a function to grab the contents of this field?