The majority of Physiology of Organisms students have a biological background, and lack A2-level physics or equivalent. Physics is certainly NOT required for this course, and most of the course requires very little or no physics.
However, some of the early lectures and practicals in the Michaelmas term, especially those on neurobiology, do require some basic physics, especially some understanding of simple electrical circuits (voltage, current, resistance, Ohm's law), and some slightly more advanced material (e.g. capacitance). Much of this will be taught to you as part of the course, and your College supervisors are always available to help you personally with any problems that you might be experiencing. Please note that although the first few lectures and practical might be challenging to you if you have not taken any physics before, the level of physics required is not that great, help is available - and it does get a LOT easier!
We have made some electronic resources available to help you with the physics that you will need, if it is entirely new to you: please have a look at An Introduction to Electrical Circuits, which is also accessible via the Moodle website. If you are experiencing difficulties with other areas of physics relating to the course, please let Dr. Matt Mason know about it, and he might be able to add some explanation to the same website.
If you are still concerned about your level of physics, some of the following books, which might be found in your College libraries, could be helpful:
Benadek, G.B. & Villars, F.M.H. (2000) Physics with Illustrative Examples from Medicine and Biology, 2nd ed. Springer-Verlag New York Inc.
Duncan, G. (1999) Physics in the Life Sciences, 3rd ed. Disce Publications.
Hobbie, R.K. (2006) Intermediate Physics for Medicine and Biology, 4th ed. Springer-Verlag New York Inc.