One of the common hazards onboard a vessel...

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Question 1 of 205eccef9ebacbc34ba4d4658e

One of the common hazards onboard a vessel is represented by the accumulation of harmful gases in tanks, holds, etc. Which of the following gases is the most dangerous to personnel safety in confined atmospheres, as it is absorbed by the blood 300 times more quickly than oxygen?

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🔍 Key Concepts

• Confined space hazards and why certain gases are especially dangerous in tanks/holds • How some gases bind to hemoglobin in the blood and displace oxygen • Difference between gases that simply displace oxygen (asphyxiants) and those that chemically bind to blood (chemical asphyxiants)

💭 Think About

• Which of these gases is known for binding very strongly to hemoglobin, preventing oxygen from being carried in the blood? • Think about which gas can be deadly even at relatively low concentrations because of its strong affinity for blood, rather than just pushing oxygen out of the space. • Among the choices, which gas is most commonly associated with poisoning from heaters, engines, or poor ventilation in enclosed spaces?

✅ Before You Answer

• Identify which gas is a chemical asphyxiant that binds to hemoglobin, not just an inert asphyxiant that displaces air. • Recall which gas is said to bind to hemoglobin hundreds of times more strongly than oxygen, leading to "silent" poisoning. • Eliminate gases better known for explosive or irritating properties rather than for strong blood binding and "silent" toxicity in small amounts.

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