Arthropoda!!!!!!!
_Arthropods range in distribution from the deep sea to mountain peaks,
in size from the
king crab with its 12-foot armspan to microscopic insects.
Despite this unbelievable diversity,
the basic body plan of arthropods is fairly constant. Arthropods range
in about 3/4ths of all of the world population and many remain unknown
and undiscovered. It is predicted that there are 10 million types of
them!
As i said before, Arthropods have very similiar Circulatory systems even though they range from very different Systems! Some Arthropods arelobsters, spiders, insects, millepedes, centipedes, jellyfishes, snails, worms, and sea sponges.
Arthropods, Like Mollusks, have an open circulatory system. In this type of system, there is neither a true heart or capillaries as are found in humans. Instead of a heart there are blood vessels that act as pumps to force the blood along. Instead of capillaries, blood vessels join directly with open sinuses. "Blood," actually a combination of blood and interstitial fluid called 'hemolymph', is forced from the blood vessels into large sinuses, where it actually baths the internal organs.
Imagine a bucket with two hoses coming out of it, these hoses connected to a squeeze bulb. As the bulb is squeezed, it forces the water along to the bucket. One hose will be shooting water into the bucket, the other is sucking water out of the bucket.
As i said before, Arthropods have very similiar Circulatory systems even though they range from very different Systems! Some Arthropods arelobsters, spiders, insects, millepedes, centipedes, jellyfishes, snails, worms, and sea sponges.
Arthropods, Like Mollusks, have an open circulatory system. In this type of system, there is neither a true heart or capillaries as are found in humans. Instead of a heart there are blood vessels that act as pumps to force the blood along. Instead of capillaries, blood vessels join directly with open sinuses. "Blood," actually a combination of blood and interstitial fluid called 'hemolymph', is forced from the blood vessels into large sinuses, where it actually baths the internal organs.
Imagine a bucket with two hoses coming out of it, these hoses connected to a squeeze bulb. As the bulb is squeezed, it forces the water along to the bucket. One hose will be shooting water into the bucket, the other is sucking water out of the bucket.
_