תרומה למאגר כללי או לחולה לא יהודי

My family runs blood drives about 4 times a year. Recently, someone decided not to give blood because it was not being directly collected for a Jewish person. This has raised the following questions:

1) Is it halachically permitted to give blood for non-jews?

2) (If the answer to #1 is no) Is it halachically permitted to give blood to a general pool of blood that will likely be drawn upon by both jews and non-jews?

3) Is it halachically permitted to receive blood from non-jews or if the source is unknown? I understand that if one's life is in danger, all lifesaving measures may be taken, however, if there is even an issue regarding accepting "non-jewish" blood, I'd be interested in understanding the sources.

In all cases, I'd like to know which rabbanim poskin regarding these issues and how they decide.

Thank you for your time.