TheoryMedical Interpreter Practice Test Video
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Q1Which chamber of the heart pumps oxygenated blood into the aorta?
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✓ Correct answer: Left ventricle
The left ventricle is the most muscular chamber; it ejects oxygenated blood through the aortic valve into the aorta, supplying the systemic circulation. The right ventricle pumps deoxygenated blood to the lungs.
Q2The mitral valve separates which two chambers of the heart?
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✓ Correct answer: Left atrium and left ventricle
The mitral (bicuspid) valve lies between the left atrium and left ventricle, preventing backflow of blood when the ventricle contracts. The tricuspid valve performs the equivalent role on the right side.
Q3What does the term 'systolic blood pressure' refer to?
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✓ Correct answer: Pressure when the heart contracts
Systolic pressure is the peak arterial pressure generated when the left ventricle contracts (systole). Diastolic pressure reflects the resting phase between beats.
Q4Which node is considered the primary pacemaker of the heart?
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✓ Correct answer: Sinoatrial (SA) node
The sinoatrial (SA) node, located in the right atrium, spontaneously generates the electrical impulse that initiates each heartbeat at 60–100 beats per minute. If it fails, the AV node takes over at a slower rate.
Q5A patient describes chest pain that radiates to the left arm and jaw. Which condition is most consistent with these symptoms?
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✓ Correct answer: Myocardial infarction
Classic myocardial infarction (heart attack) presents with crushing chest pain radiating to the left arm, jaw, or shoulder due to referred pain from ischemic cardiac tissue. Pericarditis pain typically worsens when lying flat.
Q6A patient is told they have 'atrial fibrillation.' Which statement best describes this condition?
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✓ Correct answer: Chaotic electrical activity in the atria causing an irregular heartbeat
In atrial fibrillation, multiple ectopic foci fire chaotically in the atria, producing an irregularly irregular ventricular response. The AV node acts as a partial gatekeeper, but rhythm and rate are unpredictable.
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