The pumping of the heart is tied to the respiratory system
The phylum Echinodermata , which contains about 6000 species, gets its name from the Greek, literally meaning "spiny skin." Many echinoderms actually do have "spiny" skin, but others do not. This phylum exists exclusively in the sea, and cannot be found on land or in fresh water. All echinoderms have one thing in common: radial symmetry. This means that the creatures have appendages (or body construction) which point outward from the center of the body like the spokes on a bicycle wheel. Furthermore, these appendages usually occur in multiples of five, although there are a few exceptions. There are several well known members of this group, like sea stars and sea urchins. The radial symmetry is obvious in these creatures.
One should look for the Compact bone to indicate that the break is almost completely healed.
<h3>Where is compact bone in the body?</h3>
Compact bone is known to be a form of a thick, strong bone that is made up of the two types of bone tissue.
It act in the capacity of providing support and protection and as such, One should look for the Compact bone to indicate that the break is almost completely healed.
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I am not that sure but I think endocrine cell don't contain blood vessels
