Biology NEET Full Syllabus Mock Test 180 Questions New Syllabus Mock Test - 14 PCB Single Correct MCQ
Published on: August 14, 2026

A 30-year-old chronic smoker complains of fatigue and breathlessness. Which of the following findings cannot be related to smoking in this person?

A
Nicotine stimulates adrenaline release, which increases blood pressure and indirectly reduces oxygen delivery.
B
Carbon monoxide from smoke binds with haemoglobin, reducing its oxygen-carrying capacity.
C
Nicotine increases heart rate, leading to faster oxygen utilization and haemoglobin desaturation.
D
Nicotine causes increased CO concentration in blood, which causes an increase in the concentration of haembound oxygen.

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Text Solution

Verified by Experts
The correct answer is:
D

• Smoking increases carbon monoxide (CO) content in blood and reduces the concentration of haembound oxygen. This causes oxygen deficiency, in the body.

• Tobacco smoke contains a large number of chemical substances including nicotine, an alkaloid. Nicotine stimulates adrenal gland to release adrenaline and noradrenaline into blood circulation, both of which raise blood pressure and increase heart rate.

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