1) The main function of the circulatory system is  a) To give the body structure and support b) Excrete waste. c) transport blood, nutrients, and gases throughout the body 2) Which is responsible for providing oxygen to cells? a a) respiratory system b) circulatory system c) muscular 3) Which describes a task performed by the circulatory system? a) creating red blood cells b) sending messages to the brain c) transporting waste materials. 4) What is the main organ of the circulatory system? a) small intestine b) heart c) lungs 5) Arteries carry oxygen rich blood away from the heart. a) True b) False 6) How does the heart work? a) It pumps blood first to the lungs, back to the heart and then around the rest of the body. b) It pumps blood first to the rest of the body, back to the lungs and then to the heart. c) It pumps blood around the rest of the body, back to the heart and then to the lungs. 7) How many chambers does the heart of mammals have? a) 4 b) 2 c) 3 8) With circulation, the heart provides your body with: a) Oxygen b) Nutrients c) A way to get rid of waste d) All of the above 9) The circulatory system is composed of: a) The heart, the brain, and the lungs. b) The heart, blood, and blood vessels. c) The lungs, the blood, and the blood vessels. 10) in fish, where does gas exchange takes place... a) at the gills b) at the lungs c) at the skin 11) which of the following have 3 chambers of their heart? a) snake, crocodile, frog b) frog, snake, parrot c) parrot, elephant, bat 12) which groups of these animals that have double circulation pathway? a) mammals, bird and amphibians b) mammals only c) mammals, reptile and fish d) fish and amphibians 13) the throbbing of the blood vessels because of the contraction of the heart muscle is called? a) pulse b) heart rate c) frequency 14) which of these are correct factors that affect our heart rate? a) age, health, activity b) health, age, diet c) age, exercise and diet 15) ....... is condition when white blood cells in the blood multiply abnormally in the bone marrow a) anemia b) arteriosclerosis c) leukaemia

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