🔍 Key Concepts

• Proper CPR compression depth for an adult victim • Difference between adult, child, and infant CPR guidelines • Why adequate chest compression depth is critical for circulation

💭 Think About

• Think about which option seems deep enough to squeeze the heart effectively between the sternum and spine in an adult chest. • Consider current CPR standards: does adult CPR usually call for shallow or relatively deep compressions? • Compare the listed depths and ask which range is most likely to create enough blood flow without causing excessive injury.

✅ Before You Answer

• Confirm you are thinking about adult CPR, not child or infant. • Visualize the actual distance on a ruler to see how much each option really is. • Ask: Which range best matches what you’ve learned about effective compression depth in basic first aid/CPR training?