Circulation in Animals questions : MCQs
-- The body of every living being is made up of cells.
-- There are two types of circulatory systems in animals
-- Open systems - here the cells are bathed in the blood (Example: locusts)
-- Closed systems - here the cells are provided with blood via vessels. (Example: mammals such as kangaroos)
-- Supply of Oxygen, water and food, Protective Agents and constant removal of CO2 and other waste products (urea and water) are the need of every living cells.
-- The number of heart chambers differs wholly ranging from 2-4 in vertebrates
-- Three main types of Blood Vessels are found in the circulatory system of vertebrates (Arteries, Veins and Capillaries).
-- Sponges and Hydra (Lower animals) use water from surrounding medium as their circulatory fluid.
-- In case of higher animals, the food and oxygen are taken inside the body through digestive and respiratory system.
-- The circulation of blood was first discovered by the English Physician, William Harvey in 1628. he demonstrated that blood is not a stable liquid.
-- The flow of the extracellular body fluids occurs through blood and lymph, from one part of the body to the other parts is called circulation. Blood and lymph are collectively called extracellular fluids.
-- Circulatory system includes blood vascular system and lymphatic system and both are interconnected.
-- For efficient flow of blood the multicellular forms have developed pumping organ called heart and channels called blood vessels.