Biology Questions and Answers
The body of gastropods is divided into
three main pmass and foot.ortions: head, the visceral
- What is the type of
digestive system in molluscs?
Molluscsand a complet present extracellular de digestive system, withigestion
mouth and anus.
- What is the radula? What is
the function of this organ?
Some molluscsstructure with harsh have a tonsaliences similargue-like (^) to
small teeth. This structure is called
radula. Thelps to scrape fhe radula projects outside ood. and
- How is the respiratory
system in aquatic molluscs
characterized? What adaptive
respiratory structure do
terrestrial molluscs present?
Aquatic molluscs oxygenate their blood
through gills in direct contact withwater. In terrestrial molluscs the rich (^)
vascularityabsorbs air d under the mantle cavityoing the role of a primitive (^)
lung.
- Which type of circulatory
system do molluscs have?
How can it be compared to the
respiratory system of
annelids?
Molluscs,cephalopods, have an open circulatory with the exception of (^)
system, i.e., the blood circulates within
vessels,open lacunas o from thr cavities.e heart, b In annelids thut it also fills (^) e
circulatory system is closed, i.e., the
blood circulatesvessels. only inside blood
- How is the large size of
some cephalopods related to
the type of circulatory system
they present?
In cephalopoclosed and this pds the circulatoryrovides more speed system is
and pressure for the blood circulation
allowinlarge bodies, like octog the existence of species withpuses and giant (^)
squids.
- How is the excretory
system of molluscs
characterized?
Molluscs have one or two pair of
spongelike nephridia, similar to kidneys.
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