Exams › NEET › Biology

The diagram shows a standard ECG with labels A to D. Select the option which gives correct identification of label and functions of the part:

1. A – Artery - thick walled and blood flows evenly
2. B – Capillary - thin without muscle layers and wall two cell thick
3. C – Vein - thin walled and blood flows in jerks/spurts
4. D – Pulmonary vein - takes oxygenated blood to heart PO2 = 95 mmHg

Correct answer: D – Pulmonary vein - takes oxygenated blood to heart PO2 = 95 mmHg

Solution

The pulmonary vein is the vessel that brings oxygenated blood from the lungs to the left atrium, so its PO2 is high (about 95 mmHg). The other options describe artery, capillary, or vein features incorrectly or mismatch the label.

Related NEET Biology questions

• Which is true about the difference between cortical and juxtamedullary nephrons?
• Which one of the following is correct?
• Erythropoiesis starts in:
• Person with blood group AB is considered as universal recipient because he has:
• Adult human RBCs are enucleated. Which of the following statement(s) is/are most appropriate explanation for this feature? (1) They do not need to reproduce (2) They are somatic cells (3) They do not metabolize (4) All their internal space is available for oxygen transport
• All the components of the nodal tissue are autoexcitable. Why does the SA node act as the normal pacemaker?

⚔️ Practice NEET Biology free + battle 1v1 →