Use LEFT and RIGHT arrow keys to navigate between flashcards;
Use UP and DOWN arrow keys to flip the card;
H to show hint;
A reads text to speech;
13 Cards in this Set
- Front
- Back
|
phylum |
Mollusca |
|
|
Habitat |
Many are in marine - some live in moist land |
|
|
Symmetry |
Bilateral symmetry |
|
|
body structure |
range i size can grow to 1 m long , mollusks such as octopus undergo protostome development and might have been the first animals in the course of evolution to have coelom ( which allowed more complex tissues and organs) they have soft internal body and two digestive tracts , muscular foot and mantle(surrond the internal organs )which secrets calcium carbonate to form a shell and in other including slug are adapted to life without hard outer covering there external features are very different |
|
|
Circulation |
mollusks have well developed circulatory system that includes a chambered heart |
|
|
open circulatory system |
most mollusks have it it's when blood is pumped out of the vessels into open spaces -slow moving animals(snails and clams) |
|
|
nervous system |
they have a nervous system that coordinates their movement & behavior |
|
|
complexity of NS |
- some mollusks have simple NS, simple eye structure that reflects light - other mollusks such as octopuses have more complex NS & might also have a brain, can also have complex eye structures such as humans |
|
|
movement |
muscular foot of a clam enables it to burrow into wet sand |
|
|
movement in two shelled mollusks, snails, & squids |
- two shelled: clap their shells for short bursts of rapid swimming - snails & slugs: secretion of mucus in foot help them to creep on land - squids & octopuses: take water into the mantle cavity & expel it through siphon |
|
|
mechanism of defense for octopuses & squids |
ejecting water so rapidly that they appear jet-propelled |
|
|
feeding & digestion |
- Radula: a tonguelike organ with rows of teeth,mouth. - Herbivorous mollusks: use their radulas to scrape algae off rocks. - Carnivorous mollusks: use their radulas to drill into the other mollusks and feed on their internal body parts. - The digestive system: has a mouth and an anus. |
|
|
respiration |
Gills: - parts filamentous projections that are like the fringes of a blanket - contain a rich supply of blood for the transport of oxygen to the blood and for the removal of carbon dioxide from the blood - move water into and through the mantle cavity in a continuous stream - are highly branched structures, which increases the surface area through which gases can diffuse, this enables the gills to take in more oxygen from water - In some mollusks gills also function in filter feeding |
