Agents which contains a serotonin derivative as an active ingredient are effective for improving hemodynamics and for preventing or improving deterioration of hemodynamics associated with aging and progression of cardiovascular diseases. The truss structure is positively andor materially joined with at least one of an outwardly accessible, separately manufactured functional element and a second sheet element. A waste storage compartment is configured within the body separate from the opening for storing used tissues. In a preferred embodiment, the plant is Arabidopsis and the morphological marker is Gl1, which is associated with trichome production on plant leaves.