10NL - AK in rr pot

[Gospy]

Full Tilt Poker - No Limit Hold'em Cash Game - $0.05/$0.10 Blinds - 5 Players - (LegoPoker Hand History Converter)

SB: $4.20
BB: $11.65
UTG: $10.65
Hero (CO): $10.30
BTN: $11.85

Preflop: Hero is dealt K[img]/images/graemlins/diamond.gif[/img] A[img]/images/graemlins/heart.gif[/img] (5 Players)
UTG folds, <font color="red">Hero raises to $0.35</font>, 2 folds, <font color="red">BB raises to $1.10</font>, Hero calls $0.75

Flop: ($2.25) J[img]/images/graemlins/heart.gif[/img] 7[img]/images/graemlins/heart.gif[/img] A[img]/images/graemlins/club.gif[/img] (2 Players)
BB checks, <font color="red">Hero bets $1.75</font>, <font color="red">BB raises to $4.50</font>, Hero???

This guy was 21/16, hadn't played too much with him though. What's the standard play here?, I run into this every so often.

[Spinners]

I push at this level.