Biology Questions and Answers
Circulatory System
- What is circulation?
Circulation is the movement of
substanceswithin blood vessels and cavities like nutrients and gases
throughout the organism.
- Do all animals have a
circulatory system?
Not all animals have a circulatory
system.
Poriferans, cniand nematodes (in darians, platyhthese there are theelminthes
pseudocoelom fluid but no vessels) are
avascular animals.have true circulatory systems Echinoderms do either. not
- What is the alternative
means for transport of
substances in animals without
a circulatory system? Why is
blood important for larger
animals?
In animalscirculatory system that do not present the the transport of (^)
substancesdiffusion. occurs by cell to cell
The blood is a fsubstance transpoundamental means ofrt for larger animals (^)
since in these animalsdistant from each other and from the there are tissues
environment thus making diffusion
impossible.
- What are the two types of
circulatory systems?
The circulatoryinto open circulatory systems system an can be classifiedd closed
circulatory system. - What is an open circulatory
system?
Open circulatory system is the one in
which bloinside blood vessels bod does not circulate out it also falls innly (^)
cavities that irrigate tissues. In the open
circulatory systemlow and generally the blood (calle the blood pressure isd
hemolymph) has low cellularity.
Arthropods, molluscsare exception) and protochor (the cephalopodates haveds (^)
open circulatory system.
- What is a closed circulatory
system?
A closewhich blod circulatoryod circulates system only insid is one ine blood (^)
vessels.pressure is higher in animals For this reason the blood with closed (^)
circulatory system. The cellularity of the
blood is also higher with many blood cells. specific
The closed circulatory system isfeature of annelids, cephalopod molluscs a (^)
and vertebrates.
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