Biology Practice: Circulatory System (Mock Test 3 - Advanced Mechanisms)
1. The 'Cardiac Cycle' involves the sequence of events in one heartbeat. What is the approximate duration of one complete cardiac cycle in a normal adult?
2. During blood clotting, which enzyme converts the soluble protein 'Fibrinogen' into insoluble 'Fibrin' threads?
3. Why is the 'Sino-Atrial Node (SA Node)' called the natural pacemaker of the heart?
4. The 'Hepatic Portal System' is unique because it starts and ends in:
5. Which of the following describes 'Double Circulation' correctly?
6. 'Diapedesis' is a specialized movement shown by White Blood Cells. This allows them to:
7. The 'Chordae Tendineae' are strong, fibrous strings found in the heart. Their function is to:
8. Which condition is characterized by a significant increase in the number of White Blood Cells, often called 'Blood Cancer'?
9. During 'Ventricular Systole', which valves are closed to prevent blood from flowing back into the atria?
10. 'Lymph' is similar to blood plasma but is different because it:
11. The only vein in the body that carries oxygenated blood is the:
12. What is 'Thrombosis'?
13. The 'LUBB' sound of the heart is produced by the sudden closure of:
14. Which part of the brain controls the heart rate involuntarily?
15. 'Spleen' is often referred to as the 'Graveyard of RBCs' because:
16. 'Phagocytosis' is a process where WBCs:
17. The 'Biconcave' shape of RBCs is an adaptation to:
18. 'Haemophilia' is a genetic disorder where the blood:
19. The artery that supplies oxygenated blood to the heart muscles themselves is the:
20. 'Palpitation' is a condition where the heart beats:
