Neither cnidarians nor turbellarians possess a circulatory system. For most large, active animals, this would pose a (fatal) problem. Describe and discuss the features of large active cnidarians ands turbellarians that allow them to respire, nourish their cells, and excrete despite the absence of a conventional circulatory system.
Neither cnidarians nor turbellarians possess a circulatory system. For most large, active animals, this would pose a (fatal) problem. Describe and discuss the features of large active cnidarians ands turbellarians that allow them to respire, nourish their cells, and excrete despite the absence of a conventional circulatory system.
The proper circulation of blood is very much essential for the survival of all vertebrates. They have a closed circulatory system and it is made up of a number of veins, arteries and capillaries. It allows the cells to oxygen exchange and excrete the cell waste products. It also carries nutrients for the cells. An uninterrupted circulation of blood which carries nutrients, hormones and respiratory gases is important for a healthy cellular environment. The main components of the circulatory system are the heart and blood vessels and there are two pathways through which the circulation happens; pulmonary and systemic circulation.
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