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Poiseuille's law explains the rate of flow of the bulk fluid throughout the entire circulatory system through the differences of blood pressure and vascular resistance. [31] Video of an octopus at rest and then moving through the water. Like those of vertebrates, octopus blood vessels are very elastic, with a resilience of 70% at physiologic ...
The common octopus can hear sounds between 400 Hz and 1000 Hz, and hears best at 600 Hz. [66] Octopuses have an excellent somatosensory system. Their suction cups are equipped with chemoreceptors so they can taste what they touch. [67] Octopus arms move easily because the sensors recognise octopus skin and prevent self-attachment. [68]
The octopus Thaumoctopus mimicus is known to mimic a number of different venomous organisms it cohabitates with to deter predators. [46] While background matching, a cephalopod changes its appearance to resemble its surroundings, hiding from its predators or concealing itself from prey.
A siphon is an anatomical structure which is part of the body of aquatic molluscs in three classes: Gastropoda, Bivalvia and Cephalopoda (members of these classes include saltwater and freshwater snails, clams, octopus, squid and relatives). Siphons in molluscs are tube-like structures in which water (or, more rarely, air) flows.
The only other possible contender for the largest species of octopus is the seven-arm octopus (Haliphron atlanticus), based on a 61-kilogram (134-pound), incomplete carcass estimated to have a live mass of 75 kg (165 lb).
An open circulatory system is made up of a heart, vessels, and hemolymph. This diagram shows how the hemolymph is circulated throughout the body of a grasshopper. The hemolymph is first pumped through the heart, into the aorta, dispersed into the head and throughout the hemocoel, then back through the ostia that are located in the heart, where ...
Ventral view of the viscera of Chtenopteryx sicula, showing the presence of the branchial hearts.. Branchial hearts are accessory pumps that supplement the action of the systemic heart in a cephalopod's body.
East Pacific red octopus, rescued from a gull near Los Osos, California. Octopus rubescens (commonly the East Pacific red octopus which is a Cephalopod, and also known as the ruby octopus, a preferred common name due to the abundance of octopus species colloquially known as red octopus [1]) is the most commonly occurring shallow-water octopus on much of the North American West Coast and a ...