Understanding Smell and Hydrogen Sulfide

The video explores the surprising ability of skin to detect smells, particularly hydrogen sulfide gas, during underwater expeditions. It explains the toxic nature of hydrogen sulfide and how it can deaden olfactory nerves. The video also touches on how animals adapt to urban environments by using sewer systems to avoid human activity.

What surprising discovery was made about human smell during an expedition?

• Humans can smell in the dark.

• Humans can smell underwater.

• Humans can smell through their skin.

• Humans can smell without breathing.

What is the characteristic smell of hydrogen sulfide gas?

• Fresh and minty

• Sweet and floral

• Burnt toast

• Rotten egg

Why is hydrogen sulfide gas considered dangerous?

• It is radioactive.

• It causes hallucinations.

• It is extremely toxic in high concentrations.

• It is highly flammable.

How can divers tell they have been exposed to hydrogen sulfide for too long?

• They start feeling dizzy.

• They stop smelling the gas.

• Their vision becomes blurry.

• Their skin turns blue.

What happens to the olfactory nerves with prolonged exposure to hydrogen sulfide?

• They become more sensitive.

• They regenerate quickly.

• They become deadened.

• They change color.

How do animals adapt to urban environments according to the video?

• By flying over buildings.

• By using tunnels and sewers.

• By becoming nocturnal.

• By changing their diet.

What is one reason animals might use sewer systems in urban areas?

• To stay warm.

• To escape predators.

• To avoid traffic and people.

• To find food.