Physiology is a prerequisite for Faculty of Dentistry in both U of Toronto and U of Western Ontario.
But McMaster U does not have a Physiology course, so Physiology prerequisites for Dentistry at the University of Western Ontario are substituted by Biology 3U03 + 3UU3 (both)
Do Biology 3U03 and 3UU3 substitute physiology for U of T as well, or does it require some other courses?

Bio 3U03 and 3UU3 are the physiology courses like you said. But it would be best to call up U of T and get a definite answer. It's better to be safe with this sort of thing.

3U03 and UU3 are also good for U of T.
U of T also takes Bio 2A03, the introductory physio.