Identify the correct statement about the blood vessels:
A. Venules are smaller than capillaries.
B. Capillaries have thick muscular walls.
C. Arteries have valves.
D. Veins have thinner walls and larger lumen than arteries.
Answer: Option D
Solution (By JKExamLibrary)
Veins have thinner walls and larger lumens; arteries are thick and elastic; capillaries are thin for exchange; venules are larger than capillaries. Valves are in veins.
Explanation:
Albert Sabin developed the attenuated oral polio vaccine (OPV), which is easier to administer and provides intestinal immunity. Salk developed the inactivated vaccine (IPV).
Explanation:
The Haber-Bosch process synthesizes ammonia from N₂ and H₂ under high temperature and pressure with a catalyst. It is the main industrial nitrogen fixation for fertilizers. Biological fixation is by microbes.
Explanation:
About 70% CO₂ is carried as bicarbonate. The main stimulus is high CO₂; external respiration is in lungs; diaphragm moves downward (contracts) during inhalation.
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