Q. Consider the following statements regarding human vascular biology:
1.Arteries invariably carry oxygen-rich blood, while veins exclusively transport deoxygenated blood throughout the human body.
2.Nitric Oxide (NO) serves as a vital regulator by relaxing smooth muscles in blood vessels, thereby facilitating vasodilation and improved flow.
3.Capillaries act as the primary site for material exchange between the blood and tissue cells due to their thin-walled structure.
How many of the statements given above are correct?
Answer: B
Notes:
Explanation:
- Statement 1 is incorrect: The Pulmonary Artery carries deoxygenated blood, and the Pulmonary Vein carries oxygenated blood. They are the exceptions.
- Statement 2 is correct: Nitric Oxide is a well-known vasodilator.
- Statement 3 is correct: Capillaries are designed specifically for the exchange of O2, nutrients, and waste.
