1) What is the shape of a red blood cell? a) Flat b) Spherical c) Biconcave d) Not a definite shape 2) What is the shape of a white blood cell? a) Flat b) Spherical c) Biconcave d) Not a definite shape 3) Three organs of our circulatory system are  a) Our heart, blood and kidneys b) Our kidneys, guts and blood c) Our brain, bones and blood d) Our heart, blood and blood vessels 4) What are the components of our blood? a) Red blood cells, white blood cells, platelets and plasma b) Red blood cells, protein, platelets and plasma c) Carbon dioxide, white blood cells, platelets and capillaries d) Red blood cells, white blood cells, platelets and blood vessels 5) Red and white blood cells are produced in a) The heart b) Our kidneys c) Our bone marrow d) Tissues 6) Life span of our red blood cells is nearly a) 3 day b) 1-3 days c) 50 days d) 100 days 7) Platelets help in a) carrying oxygen to our cells b) protecting our body from infections c) blood clotting d) regulating our body temperature 8) Plasma helps in a) protecting our body from infections b) carrying oxygen to our cells c) blood clotting d) regulating our body temperature 9) Red blood cells help in a) regulating our body temperature b) carrying oxygen to our cells c) blood clotting d) protecting our body from infections 10) White blood cells help in a) regulating our body temperature b) carrying carbon dioxide to our cells c) protecting our body from infections d) blood clotting 11) 90% of our blood is made up of a) platelets b) plasma c) red blood cells d) white blood cells 12) The nutrients in our food are carried to our cells by a) Our kidney b) Our guts c) Our blood d) Our liver 13) Plasma makes up ________ % of our blood a) 5 b) 40 c) 55 d) 90 14) The hormones and waste products are carried by _______________________ in our body. a) plasma b) red blood cells c) white blood cells d) platelets 15) The platelets constitute only ___________% of our blood. a) 3 b) 55 c) 1 d) 0.01 16) Plasma is mainly ______________________ with some dissolved nutrients, waste products and hormones. a) water b) red blood cells c) white blood cells d) platelets 17) How does the protein from our food reaches our muscle cells? a) It is absorbed by our kidney and sent to our muscles. b) Our blood absorbs and carries protein molecules to our muscle cells. c) Our small intestine carries it. d) It is carried by our liver. 18) Carbon dioxide is a waste product that is carried away to our lungs by a) hemoglobin b) hormones c) oxygen d) plasma 19) The protein hemoglobin is present in a) red blood cells b) white blood cells c) platelet d) plasma 20) What is the color of our white blood cells? a) White b) Purple c) Colorless or purple d) Colorless 21) White blood cells can live only for ________ days a) 100 b) 1-3 c) 50 d) 10 22) Which blood group can accept blood from all donors? a) O+ b) A- c) AB- d) AB+ 23) Which blood groups can donate blood to a person having a blood group A+?  a) O+, A+ b) AB+, A+ c) A- , AB- d) AB-, AB+

The Circulatory System

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