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UNIVERSAL EDUCATION ICSE GRADE X SUBJECT : BIOLOGY CHAPTER 7 - CIRCULATORY SYSTEM Question 1 (a) Name the following. 1. The phase of the cardiac cycle in which the ventricle relax. Ans. Ventricular diastole 2. The respiratory pigment in erythrocytes. Ans. Haemoglobin 3. The blood vessel which carries oxygenated blood to the liver. Ans. Hepatic artery. 4. The valve present in between the chambers of the right side of the human heartAns. Tricuspid valve. 5. A fluid that transports fatty acid and glycerol. Ans. Lymph. 6. A disease in which blood fails to clot naturally. Ans. Haemophilia. 7. The yellow coloured fluid part of the blood. Ans. Plasma. 8. Any two organelles absent in matured RBCs. Ans. Nucleus and Mitochondria. 9. Average life of RBCs. Ans. 120 days. 10. Two major categories of WBCsAns. Granulocytes and Agranulocytes. 11. Blood cells involved in Leukemia. Ans. WBCs. 12. The vitamin required for clotting of blood. Ans. Vitamin K. 13. The cells that initiate blood clotting. Ans. Blood platelets. 14. The wall that separates the left and right side of the heart. Ans. Septum. 15. The outer covering of the heart. Ans. Pericardium. 16. The fluid that helps the heart to contract smoothly. Ans. Pericardial fluid. 17. The largest artery. Ans. Aorta.
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