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Consider the following statements about biomedical technologies: 1. During open heart surgery blood is circulated in the heart-lung machine 2. Blockage in coronary arteries is removed by angiography 3. Computerised axial tomography (CAT) shows detailed internal structure as seen in a section of body 4. X-ray provides clear and detailed images of organs like prostate glands and lungs Which two of the above statements are correct?

1. 2 and 4
2. 3 and 4
3. 1 and 3
4. 1 and 4

Correct answer: 1 and 3

Solution

Statement 1 is correct because a heart-lung machine takes over circulation and oxygenation during open-heart surgery. Statement 3 is correct because CAT/CT produces detailed cross-sectional images of internal structures. Statement 2 is wrong because angiography is used to visualize blood vessels, not remove blockages, and statement 4 is wrong because X-rays do not give such detailed soft-tissue images.

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