Assertion: spider's heart | /r/HasProperty | tube
Facets:
value: with a few ostia
type: OTHER
Source sentences:
text: The heart is a tube in the upper part of the body, with a few ostia that act as non-return valves allowing blood to enter the heart from the hemocoel but prevent it from leaving before it reaches the front end.
text: The spider's simple heart -- a tube surrounded by a muscle, with a one-way valve on each end -- pumps blood into the body cavity, all around the spider's organs.