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For example, vertebrates modify arteriole diameter to regulate blood flow into capillary beds (Eckert et al., 1988), sponges change water flow by contracting or relaxing porocytes and myocytes as water enters the animal (Bagby, 1964; Pearse et al., 1987), and bivalves adjust flow through the alteration of siphon dimensions (Foster-Smith, 1976; Jorgensen et al., 1986, 1988).