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en.wikipedia.org/wiki/Fish_anatomy

Fish anatomy is the study of the form or morphology of fishes.It can be contrasted with fish physiology, which is the study of how the component parts of fish function together in the living fish. In practice, fish anatomy and fish physiology complement each other, the former dealing with the structure of a fish, its organs or component parts and how they are put together, such as might be ...

myfwc.com/fishing/freshwater/fishing-tips/anatomy

Anatomy; Fish Anatomy. External Fish Anatomy. The following illustration of a largemouth bass shows some of the common external features that are used to describe the differences between fish that are explained in more detail below. ... Heart: Circulates blood throughout the body. Oxygen and digested nutrients are delivered to the cells of ...

www.petcoach.co/article/cardiovascular-system-the-heart-and-vessels-of-mammals...

Fish Heart External View . Fish Heart Internal View. Fish. Fish possess the simplest type of true heart a two-chambered organ composed of one atrium and one ventricle. A rudimentary valve is located between the two chambers. Blood is pumped from the ventricle through the conus arteriosus to the gills.

seaworld.org/animals/all-about/bony-fish/anatomy-and-physiology

A bony fish's heart has two chambers: an atrium and a ventricle. The venous side of the heart is preceded by an enlarged chamber called the sinus venosus. The arterial side of the heart is followed by a thickened muscular cavity called the bulbus arteriosus.

www.yourarticlelibrary.com/fish/anatomy-and-physiology/heart-structure-of-fishes...

ADVERTISEMENTS: In this article we will discuss about Cardiovascular System in Fish e.g. 1. Structure of Heart 2. Pathology of Heart 3. Innervation. Structure of Heart: The heart of fishes is known as branchial heart, because its main function is to pump venous blood to ventral aorta into gills (branchial) and then to somatic vasculature.

socratic.org/questions/what-is-the-structure-and-function-of-the-heart-of-a-fish

The Heart is a pumping device that pumps blood. The heart of a fish is a two-chambered heart. It has one Auricle and one ventricle. Blood from all the parts of the body is sent to auricle, auricle pumps that blood to ventricle and ventricle pumps that blood to gills for the purpose of oxygenation. From the gills, oxygenated blood is supplied to all the parts of the body.

esi.stanford.edu/circulation/circulation5.htm

The heart is the pump that generates the driving pressure for the circulation of blood (P1 = the arterial pressure in the previous pages). The fish heart has one atrium and one ventricle; this is in contrast to the human (mammalian) heart that has two separate atria and two separate ventricles.

www.biozoomer.com/2014/02/frog-heart-structure-fish-heart.html

11.The fish heart is venous or branchial heart because it receives deoxygenated blood only. 11.The frog's heart receives both oxygenated and deoxygenated blood. The deoxygenated blood remain separate in the auricles but get mixed in the ventricle. 12.Blood passes only once through the heart in a complete circuit.

esi.stanford.edu/circulation/circulation6.htm

Before we go further into fish circulation, let's compare a human with a fish to get a perspective on the anatomy and function. In mammals (like us) there is a double circulation. The right side of the heart receives blood returning back from the body; this blood is low in oxygen (blue in the figure to the right). ... In fish, the heart only ...