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  2. Acorn worm - Wikipedia

    en.wikipedia.org/wiki/Acorn_worm

    Acorn worms have an open circulatory system, in which the blood flows through the tissues sinuses. A dorsal blood vessel in the mesentery above the gut delivers blood to a sinus in the proboscis that contains a muscular sac acting as a heart. Unlike the hearts of most other animals, however, this structure is a closed fluid-filled vesicle whose ...

  3. Fish physiology - Wikipedia

    en.wikipedia.org/wiki/Fish_physiology

    [1] Fish physiology is the scientific study of how the component parts of fish function together in the living fish. [2] It can be contrasted with fish anatomy, which is the study of the form or morphology of fishes. In practice, fish anatomy and physiology complement each other, the former dealing with the structure of a fish, its organs or ...

  4. Nautilus - Wikipedia

    en.wikipedia.org/wiki/Nautilus

    Whereas fish or crustaceans brought up from such depths inevitably arrive dead, a nautilus will be unfazed despite the pressure change of as much as 80 standard atmospheres (1,200 psi). The exact reasons for this ability, which is thought to be coincidental rather than specifically functional, are not known, though the perforated structure of ...

  5. Fish anatomy - Wikipedia

    en.wikipedia.org/wiki/Fish_anatomy

    Fish have the simplest circulatory system, consisting of only one circuit, with the blood being pumped through the capillaries of the gills and on to the capillaries of the body tissues. This is known as single cycle circulation. [49]

  6. Lancelet - Wikipedia

    en.wikipedia.org/wiki/Lancelet

    Depending on the exact species involved, the maximum length of lancelets is typically 2.5 to 8 cm (1.0–3.1 in). [47] [48] Branchiostoma belcheri and B. lanceolatum are among the largest. [47] Except for the size, the species are very similar in general appearance, differing mainly in the number of myotomes and the pigmentation of their larvae ...

  7. Chondrichthyes - Wikipedia

    en.wikipedia.org/wiki/Chondrichthyes

    Chondrichthyes (/ k ɒ n ˈ d r ɪ k θ i iː z /; from Ancient Greek χόνδρος (khóndros) 'cartilage' and ἰχθύς (ikhthús) 'fish') is a class of jawed fish that contains the cartilaginous fish or chondrichthyans, which all have skeletons primarily composed of cartilage.

  8. Bulbus arteriosus - Wikipedia

    en.wikipedia.org/wiki/Bulbus_arteriosus

    In the circulatory system of fish, the bulbus arteriosus is a pear shaped chamber that functions as a capacitor, maintaining continuous blood flow into the gill arches.

  9. Rete mirabile - Wikipedia

    en.wikipedia.org/wiki/Rete_mirabile

    In many fish, a rete mirabile helps fill the swim bladder with oxygen, increasing the fish's buoyancy. The rete mirabile is an essential [ 8 ] part of the system that pumps dissolved oxygen from a low partial pressure ( P O 2 {\displaystyle {P_{\rm {O_{2}}}}} ) of 0.2 atmospheres into a gas filled bladder that is at a pressure of hundreds of ...