Higher animals need greater in addition to speedier furnish of nutrients in addition to oxygen to their tissues in addition to equally good a rapid disposal of respiratory in addition to nitrogenous wastes. So they gain got developed blood equally a specialized circulatory fluid in addition to the circulatory organization consists of heart, blood in addition to blood vessels for conducting in addition to pumping blood to the tissues. The blood vascular organization may endure of 2 types. They are opened upwards circulatory organization in addition to unopen circulatory system. Open circulatory system Open circulation is flora inwards invertebrates similar prawn, insects, in addition to molluscs. 1. Blood flows through opened upwards spaces called lacunae in addition to sinuses 2. Blood flows at a really irksome velocity 3. Body cavity is filled amongst blood (Haemocoel*) 4. Internal organs are bathed yesteryear blood 5. Blood takes long fourth ...
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