A characteristic feature of the closed circulatory system is the
Correct answer: B. Regulation of blood pressure
- A. Absence of blood capillaries
- B. Regulation of blood pressure
- C. Absence of respiratory pigments
- D. Flow of haemolymph in cavities
Explanation
In a closed circulatory system, blood circulates within a network of vessels, allowing for efficient regulation of blood pressure. This system enables precise control over the distribution of nutrients and oxygen to various tissues. Unlike open systems, closed systems have capillaries that connect arteries and veins. Option B is correct as it highlights the regulation of blood pressure as a characteristic feature. Options A and C are incorrect because blood capillaries and respiratory pigments are present in closed systems. Option D describes an open circulatory system, where haemolymph flows in cavities, not a closed system.
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About Blood Vessels
Blood vessels include arteries, arterioles, capillaries, venules and veins, whose wall thickness, elasticity, lumen size and valves suit their roles in circulation. Questions compare pressure and blood flow in each vessel and distinguish pulmonary vessels, which carry blood to and from the lungs, from systemic vessels.
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