wear your heart on your sleeve. to make your feelings and opinions obvious to other people John's always worn his heart on his sleeve, so there's no doubt who he'll be supporting. See also: heart, on, sleeve, wear. Related vocabulary: wear something on your sleeve.
In many bivalves and snails, and in cephalopods, part of the mantle is modified into a siphon, which can be used to pump water through the mantle cavity for respiration, feeding and/or jet propulsion. Freshwater and marine mollusks have gills (called ctenidia) for respiration, located in the mantle cavity. In most bivalves, these are enlarged and serve to trap food particles as well (Morton 1983).
Mollusca Worksheet 1. For what purpose do mollusks use their muscular foot? 2. How is the muscular foot of a squid different from that of clams and snails? 3. What is a mantle and where is it located in most mollusks? 4. What is contained in the visceral mass? 5. How do most sessile and burrowing mollusks obtain food? 6. What kind of digestive tract do mollusks have? 7. How do the nervous systems of clams and octopuses differ? 8. How do mollusks reproduce; sexually, asexually, or both? 9. Where does fertilization take place in mollusks?