Fig. 4. Delay between the electrocardiogram (ECG) in the right ventricle and the ECG in the cog-wheel valve muscle as a function of the distance between the two recording sites. One ECG electrode was left fixed in the middle of the cog-wheel valve muscle, while the electrode in the right ventricle was moved to different locations. Results from three animals are shown. Inverse slopes give the conduction velocity in the right ventricle, and are 0.43 m s^-1 (P<0.001, r²=0.449), 1.41 m s^-1 (P=0.14, r²=0.037) and 0.85 m s^-1 (P<0.001, r²=0.152) from top to bottom, respectively. The intercept is the `nodal' delay at the junction of the right ventricle and cog-wheel valve muscle. Values are means ± S.E.M.