What is hypoxic stress?

• A. Low oxygen in a tissue.
• B. Normal oxygen delivery.
• C. Low oxygen content present in blood.
• D. High oxygen content in blood.

Answer: (C)

Hypoxic stress happens when tissues don’t get enough oxygen because the blood’s oxygen content is reduced. If the blood carries less oxygen, the delivery to all tissues falls, so cells must cope with a low-oxygen environment. That’s why the option describing low oxygen content present in blood best captures the cause and leads to the stress response. When oxygen in the blood is sufficient, delivery is adequate and hypoxic stress doesn’t occur; high oxygen content would not cause this stress.