Q1. Which chamber of the heart pumps deoxygenated blood into the pulmonary circulation?A. Left atriumB. Right atriumC. Left ventricleD. Right ventricle
Q2. Which of the following statements about cardiac muscle is incorrect?A. It is striated like skeletal muscle.B. It contracts involuntarily.C. It does not require oxygen for contraction.D. It has intercalated discs for synchronized contraction.
Q3. Which of the following is incorrect about leukocytes (WBCs)?A. Neutrophils are the first line of defense against infections.B. Lymphocytes produce antibodies.C. WBCs have a longer lifespan than RBCs.D. Basophils release histamine during allergic reactions.
Q4. Which of the following is NOT a function of the circulatory system?A. Transporting oxygenB. Regulating body temperatureC. Synthesizing hormonesD. Distributing nutrients
Q5. Which of the following statements about erythrocytes is incorrect?A. They contain hemoglobin for oxygen transport.B. They lack a nucleus in mature form.C. They are primarily involved in immune response.D. They have a lifespan of about 120 days.
Q6. Which of the following is correct about the pericardium?A. It is a muscular layer of the heart.B. It generates electrical impulses for contraction.C. It reduces friction between the heart and surrounding tissues.D. It pumps blood into the aorta.
Q7. Which of the following carries deoxygenated blood?A. Pulmonary veinB. Pulmonary arteryC. AortaD. Coronary artery
Q8. Which of the following blood vessels carries the highest concentration of oxygen?A. Pulmonary arteryB. Pulmonary veinC. Vena cavaD. Hepatic portal vein
Q9. Which of the following is correct about the human heart?A. The human heart has three chambers.B. The human heart is myogenic in nature.C. The right side of the heart pumps oxygenated blood.D. The left atrium receives deoxygenated blood.
Q10. Which of the following is incorrect regarding blood flow through the heart?A. The right ventricle pumps blood to the pulmonary artery.B. The left atrium receives oxygenated blood from the lungs.C. The pulmonary veins carry deoxygenated blood.D. The aorta distributes oxygenated blood to body tissues.