I installed win 8.1 on my iMac on the bootcamp partition and can't access OSX anymore. What am I doing wrong?

Ever since I installed Windows I don't have an option to switch to Mac.I installed it on the bootcamp partition with the lastest OSX and Windows versions. I did this a few years ago with an older Mac and Vista and remembered a prompt to choose OS during boot. I get nothing but Windows now. Any ideas?

if you restsrt and hold down alt, what boot options do you see
try restarting holding down command+R, choose disk utility and tell me what you see on the upper left hand side under the name of your physical drive

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