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Fig. 1. (A) Scheme of the perfusion apparatus (left) connected with the
amperometric gas sensor (right) used for nitrite detection in the cardiac
effluent. (B,C) The myoarchitecture of the icefish heart showing the extensive
and fully trabeculate ventricular wall. (B) Histological longitudinal section
(Sirius Red staining) (bar, 0.25 cm); (C) scanning electron micrograph with
details of the myocardial trabeculae and the intertrabecular spaces (lacunae)
(bar, 100 µm). (D) Transmission electron micrograph showing mitocondria and
myofibrils in ventricular myocytes. (J. M. Icardo and B. Tota, unpublished
material). P, perfusate; PT, pressure transducer.