Why conus arteriosus and sinus venosus are absent in human?
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Because human heart have four true chambers two auricles and two ventricles seprated by artrioventricular wall . Here mixing of blood do not takes place hence these are absent in human beings body.
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All vertebrates have circulatory systemsbased on a common plan, and so vertebrate systems show much less variety than do those of invertebrates. Although it is impossible to trace the evolution of the circulatory system by using fossils (because blood vessels do not fossilize as do bones and teeth), it is possible to theorize on its evolution by studying different groups of vertebrates and their developing embryos. Many of the variations from the common plan are related to the different requirements of living in water and on land.
The heart
The vertebrate heart lies below the alimentary canal in the front and centre of the chest, housed in its own section of the body cavity. During the development of an embryo, the heart first appears below the pharynx, and although it may also be in this position in adult animals, the heart often moves posteriorly as the animal grows and matures.
body; in lampreys, the pressure is lower than in arteries MORE
The heart
The vertebrate heart lies below the alimentary canal in the front and centre of the chest, housed in its own section of the body cavity. During the development of an embryo, the heart first appears below the pharynx, and although it may also be in this position in adult animals, the heart often moves posteriorly as the animal grows and matures.
body; in lampreys, the pressure is lower than in arteries MORE
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