Heart muscle. Fluorescence deconvolution light micrograph of a section through cardiac (heart) muscle tissue, showing alpha adrenoreceptors (red) between cardiac myofibrils (green), with cell nuclei (blue). Beta adrenoreceptors respond to adrenalin, causing a sympathetic (fight or flight) response. This makes the heart beat harder when adrenalin levels rise. Magnification: x400, when printed 10 cm wide.
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