2. Benzocaine has been tested as an anaesthetic for inhibition of m1 muscarinic acetylcholine signalling. Using the data below, plot a graph and determine the IC50. 20 marks Concentration (M) 1 x 10-6 % of control response 97 10 x 10-6 100 x 10-6 93 78 1000 x 10-6 56 10000 x 10-6 42 100000 x 10-6 36

Fig: 1