1 What is the average volume of blood in an adult human? A 1-2 liters B 3-4 liters C 5-6 liters D 7-8 liters
2 What is the name of the heart valve between the right atrium and right ventricle? A Aortic valve B Pulmonary valve C Tricuspid valve D Mitral valve
3 What is the name of the fluid that surrounds the heart? A Pericardial fluid B Pleural fluid C Synovial fluid D Cerebrospinal fluid
4 Which artery carries deoxygenated blood? A Aorta B Pulmonary artery C Carotid artery D Femoral artery
5 Which of the following is not a function of the circulatory system? A Production of hormones B Transport of nutrients C Removal of waste products D Distribution of oxygen
6 What is the main function of platelets? A Carry oxygen B Fight infections C Help in blood clotting D Transport nutrients
7 Which blood component is responsible for carrying oxygen? A Red blood cells B White blood cells C Platelets D Plasma
8 The muscular layer of the heart wall is called the: A Myocardium B Endocardium C Pericardium D Epicardium
9 Blood returning from the upper part of the body enters the heart through the: A Superior vena cava B Inferior vena cava C Pulmonary vein D Coronary sinus
10 The sac-like membrane that surrounds the heart is called: A Pericardium B Pleura C Peritoneum D Meninges
11 Which organ is responsible for removing old red blood cells from circulation? A Liver B Spleen C Kidney D Lungs
12 Which side of the heart pumps oxygenated blood to the body? A Right side B Left side C Both sides D Neither side
13 The pulmonary circulation involves the flow of blood between the heart and the: A Lungs B Liver C Kidneys D Brain
14 Which vein carries oxygenated blood? A Inferior vena cava B Superior vena cava C Pulmonary vein D Portal vein
15 Which blood cells help in blood clotting? A Platelets B Red blood cells C White blood cells D Plasma
16 What is the role of the circulatory system in temperature regulation? A It produces heat B It distributes heat throughout the body C It cools the body D All of the above
17 The blood vessels that connect arteries to veins are called: A Capillaries B Venules C Arterioles D Sinusoids
18 Blood vessels that carry blood away from the heart are called: A Arteries B Veins C Capillaries D Venules
19 Which of the following is true about capillaries? A They allow exchange of substances B They have thick walls C They carry blood at high pressure D They have valves
20 What is the function of the sinoatrial node? A Regulate blood pressure B Initiate heartbeat C Filter blood D Carry oxygen
22 Which of the following is NOT a component of blood? A Plasma B Red blood cells C White blood cells D Lymph
23 What is the name of the blood protein that helps in clotting? A Fibrinogen B Albumin C Globulin D Heparin
24 The largest artery in the human body is the: A Aorta B Pulmonary artery C Carotid artery D Femoral artery
25 Which chamber of the heart pumps deoxygenated blood to the lungs? A Right atrium B Right ventricle C Left atrium D Left ventricle