NEET UG · Biology

Body Fluids and Circulation

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Body Fluids and Circulation Practice Questions

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1. If a person's systolic pressure is 140 mmHg and their diastolic pressure is 90 mmHg, what is their pulse pressure and mean arterial pressure (MAP)? 2. The hepatic portal system is a unique part of the systemic circulation. What is its primary function? 3. Deep vein thrombosis (DVT) is a condition where a blood clot forms in a deep vein, usually in the leg. What is a significant risk associated with DVT? 4. Which of the following is the largest component by volume of whole blood? 5. A healthy individual experiences emotional stress, leading to a temporary increase in heart rate and blood pressure. Which part of the brain is primarily responsible for mediating this "fight or flight" response on the cardiovascular system? 6. Erythropoietin (EPO), a hormone, plays a critical role in the production of red blood cells. Where is EPO primarily produced in response to hypoxia? 7. Why is the intrinsic pathway of coagulation considered "intrinsic"? 8. A person with AB-positive blood needs a transfusion. Which of the following blood types would be considered universally compatible (within the ABO and Rh systems) for transfusion to this individual? 9. If a person experiences a sudden drop in blood pressure, how would the body's baroreflex attempt to compensate? 10. What is the primary function of lymph nodes? 11. A patient is diagnosed with polycythemia vera, a condition characterized by an overproduction of red blood cells. Which of the following is a likely physiological consequence of this condition? 12. The "lub-dub" sounds of the heart are associated with which events in the cardiac cycle? 13. Why is blood pressure typically measured in the brachial artery rather than a superficial vein? 14. Which of the following blood components is crucial for immunity by producing antibodies and memory cells? 15. In a patient suffering from congestive heart failure, pulmonary edema is a common symptom. What is the primary physiological reason for this fluid accumulation in the lungs? 16. The sinoatrial (SA) node is often referred to as the natural pacemaker of the heart because it: 17. A newborn baby is diagnosed with erythroblastosis fetalis. This condition typically arises when: 18. Place the following events of the cardiac cycle in the correct chronological order, starting after ventricular filling: 1. Ventricular ejection 2. Isovolumetric ventricular contraction 3. Isovolumetric ventricular relaxation 4. Atrial systole 19. Warfarin is an anticoagulant medication that interferes with the synthesis of vitamin K-dependent clotting factors. Which specific mechanism does it target? 20. Baroreceptors, located in the carotid sinuses and aortic arch, are primarily involved in regulating: 21. A patient's complete blood count (CBC) report shows a significantly elevated white blood cell count (leukocytosis), with a differential count indicating a high percentage of immature neutrophils (band cells). What clinical condition does this finding strongly suggest? 22. Which of the following statements correctly distinguishes between arteries and veins? 23. An ECG shows an abnormally tall and peaked T wave. What physiological imbalance could this suggest? 24. The final step in the blood clotting cascade is the conversion of fibrinogen to fibrin. Which enzyme catalyzes this specific reaction? 25. During severe hemorrhage, the body attempts to maintain blood pressure. Which of the following compensatory mechanisms would NOT primarily contribute to maintaining mean arterial pressure? 26. Which of the following valves prevents the backflow of blood into the left ventricle from the systemic circulation? 27. A patient undergoing treatment for severe anaphylactic shock is given an adrenaline (epinephrine) injection. How does adrenaline help stabilize the patient's circulatory system? 28. What is the primary difference in the fluid component between blood plasma and interstitial fluid? 29. If a person has a stroke volume of 70 mL and a heart rate of 75 beats/minute, what is their cardiac output in liters per minute? 30. Which type of white blood cell is primarily involved in specific immunity, recognizing and targeting specific pathogens? 31. An elderly patient presents with chest pain that intensifies with exertion and is relieved by rest. An angiogram reveals significant narrowing of the coronary arteries. Which condition is most likely affecting this patient? 32. A universal recipient in the ABO blood group system is defined as someone who can receive blood from any ABO type. Which blood type is considered the universal recipient and why? 33. During the cardiac cycle, immediately following the P wave on an ECG, what specific mechanical event occurs? 34. Which of the following statements about erythrocytes (red blood cells) is INCORRECT? 35. A person accidentally receives a transfusion of incompatible blood. The immediate and severe reaction, characterized by agglutination and hemolysis, is primarily mediated by: 36. Which of the following factors would lead to an increase in heart rate? 37. Why is the wall of the left ventricle significantly thicker and more muscular than the wall of the right ventricle? 38. What is the primary function of granulocytes like neutrophils and eosinophils? 39. A patient exhibits symptoms of anemia, but their red blood cell count is within the normal range. Further investigation reveals that the hemoglobin molecules in their RBCs have an abnormal structure, leading to reduced oxygen-carrying capacity. This condition is most likely a form of: 40. Which of the following accurately describes the path of deoxygenated blood in the human circulatory system? 41. If the P wave is absent in an ECG but a normal QRS complex and T wave are observed, what does this most likely suggest? 42. What is the primary role of the bicuspid valve (mitral valve) in the human heart? 43. A healthy individual's blood pressure is measured at 120/80 mmHg. During vigorous exercise, which of the following changes would primarily lead to an increase in systolic blood pressure? 44. Which component of the formed elements of blood is directly responsible for initiating blood clot formation at the site of injury? 45. A person is suffering from edema, a condition characterized by excessive fluid accumulation in interstitial spaces. Which of the following could be a contributing factor to this condition? 46. How does lymph primarily differ from blood plasma in composition? 47. During an ECG, the time interval between the start of the P wave and the start of the QRS complex (PR interval) is measured. A healthy individual typically has a PR interval between 0.12 to 0.20 seconds. If a patient's ECG shows a PR interval consistently greater than 0.20 seconds, what might this indicate? 48. Which of the following statements accurately differentiates between plasma and serum? 49. A person with type A blood is in urgent need of a transfusion. There are two donors available: one with type AB blood and another with type O blood. Considering only the ABO system, which donor's blood could potentially be transfused without immediate severe agglutination reactions? 50. A patient presents with persistent bleeding from minor cuts and internal hemorrhages. Blood tests reveal a prolonged prothrombin time and activated partial thromboplastin time. Which of the following conditions is most likely indicated?