SCENARIO: A veterinary pathologist examined tissue samples from three different animals: Animal X (a mammal), Animal Y (an insect), and Animal Z (an amphibian). The observations were as follows: - Animal X: Tissue A showed tightly packed cells with a free surface and a basement membrane. Tissue B exhibited cells with abundant extracellular matrix, containing collagen and elastic fibers. Tissue C consisted of elongated cells with striations and multiple peripheral nuclei. - Animal Y: Tissue D displayed a chitinous exoskeleton. Tissue E showed a dorsal, tubular heart. - Animal Z: Tissue F contained cells with intercalated discs. Tissue G showed cells arranged in a single layer, forming the lining of internal organs. The pathologist noted that Tissue A from Animal X was primarily involved in secretion and absorption, while Tissue C was responsible for voluntary movement. Tissue F from Animal Z was observed to be involuntary and rhythmic.