Monday, November 18, 2024

MCQ Biology Chapter 15: BODY FLUIDS AND CIRCULATION, HS 1st year

 

MCQs on Blood and Circulation:

  1. What is the primary function of erythrocytes (RBCs)?
    a) Immune response
    b) Coagulation
    c) Gas transport
    d) Nutrient absorption
    Answer: c) Gas transport

  2. Which component of plasma is essential for blood clotting?
    a) Albumins
    b) Fibrinogens
    c) Globulins
    d) Hemoglobin
    Answer: b) Fibrinogens

  3. What is the average lifespan of an RBC in a healthy human?
    a) 30 days
    b) 60 days
    c) 90 days
    d) 120 days
    Answer: d) 120 days

  4. Which of the following is known as the 'universal donor' blood group?
    a) A
    b) B
    c) AB
    d) O
    Answer: d) O

  5. Which antigen is associated with the Rh grouping system?
    a) A
    b) B
    c) O
    d) Rh antigen
    Answer: d) Rh antigen

  6. What does the P-wave in an ECG represent?
    a) Atrial depolarization
    b) Ventricular depolarization
    c) Atrial repolarization
    d) Ventricular repolarization
    Answer: a) Atrial depolarization

  7. What is the significance of the semilunar valves in the heart?
    a) To prevent backward flow into the atria
    b) To prevent backward flow into the ventricles
    c) To separate the atria
    d) To mix oxygenated and deoxygenated blood
    Answer: b) To prevent backward flow into the ventricles

  8. Which circulatory system is found in arthropods?
    a) Open circulatory system
    b) Closed circulatory system
    c) Single circulation
    d) Double circulation
    Answer: a) Open circulatory system

  9. What is the condition called when maternal Rh-negative blood reacts with fetal Rh-positive blood?
    a) Hypertension
    b) Angina pectoris
    c) Erythroblastosis fetalis
    d) Atherosclerosis
    Answer: c) Erythroblastosis fetalis

  10. What is the average cardiac output in a healthy individual?
    a) 2 liters per minute
    b) 3 liters per minute
    c) 5 liters per minute
    d) 7 liters per minute
    Answer: c) 5 liters per minute

  1. Which type of leucocyte is involved in allergic reactions and infection resistance?
    a) Neutrophils
    b) Eosinophils
    c) Monocytes
    d) Basophils
    Answer: b) Eosinophils

  2. What is plasma without clotting factors called?
    a) Serum
    b) Lymph
    c) Interstitial fluid
    d) Platelet concentrate
    Answer: a) Serum

  3. Which heart valve is located between the left atrium and left ventricle?
    a) Tricuspid valve
    b) Bicuspid valve
    c) Semilunar valve
    d) Aortic valve
    Answer: b) Bicuspid valve

  4. What percentage of blood is composed of plasma?
    a) 45%
    b) 50%
    c) 55%
    d) 65%
    Answer: c) 55%

  5. What is the term for blood pressure that is consistently higher than normal?
    a) Atherosclerosis
    b) Hypertension
    c) Angina
    d) Cardiac arrest
    Answer: b) Hypertension

  6. Which chamber of the heart receives oxygenated blood from the lungs?
    a) Left atrium
    b) Right atrium
    c) Left ventricle
    d) Right ventricle
    Answer: a) Left atrium

  7. What is the primary function of lymph in the circulatory system?
    a) Transport of oxygen
    b) Absorption of fats and immune responses
    c) Removal of waste
    d) Blood clotting
    Answer: b) Absorption of fats and immune responses

  8. Which structure in the heart is referred to as the pacemaker?
    a) Atrio-ventricular node (AVN)
    b) Bundle of His
    c) Sino-atrial node (SAN)
    d) Purkinje fibers
    Answer: c) Sino-atrial node (SAN)

  9. Which component of WBCs is phagocytic in nature?
    a) Neutrophils and monocytes
    b) Basophils and eosinophils
    c) Lymphocytes
    d) Platelets
    Answer: a) Neutrophils and monocytes

  10. What is the average stroke volume of the human heart per beat?
    a) 50 mL
    b) 70 mL
    c) 90 mL
    d) 100 mL
    Answer: b) 70 mL

  11. What is the medical term for the state when the heart cannot pump blood efficiently?
    a) Cardiac arrest
    b) Heart failure
    c) Myocardial infarction
    d) Angina
    Answer: b) Heart failure

  12. Which blood group is considered the 'universal recipient'?
    a) A
    b) B
    c) AB
    d) O
    Answer: c) AB

  13. In which type of blood vessel does nutrient and gas exchange primarily occur?
    a) Arteries
    b) Veins
    c) Capillaries
    d) Arterioles
    Answer: c) Capillaries

  14. Which hormone increases the heart rate and cardiac output during stress?
    a) Insulin
    b) Thyroxine
    c) Adrenaline
    d) Glucagon
    Answer: c) Adrenaline

  15. What is the main symptom of angina pectoris?
    a) Sudden fainting
    b) Chest pain
    c) Irregular heartbeat
    d) Difficulty in breathing
    Answer: b) Chest pain

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