Approximately how long can the average human survive without food
Chapter 1

The autopilot of your inner universe

Chapter 2

The body's internal construction crew

Chapter 3

The microscopic ecosystem keeping you alive

Chapter 4

Survival mode and extreme adaptations

Ch 4 · Survival mode and extreme adaptations
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007skaty The biological process of the emergency adrenaline surge

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007skaty The human body switches its internal fuel source during starvation.

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The mammalian dive reflex

007skaty The trigeminal nerve signals the brain to trigger bradycardia and constrict blood vessels, conserving oxygen so humans survive longer underwater.

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The healing fire of a fever

007skaty Fevers accelerate the production of white blood cells to rapidly fight off infections.

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Flip My Fuel
BETA

007skaty Flip the fuel cards to discover how your body processes nutrients to sustain itself.

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Fun Fact

Cold shock: Did you know that splashing cold water on your face can instantly reduce anxiety by triggering your dive reflex?

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Glossary
hypothermia (noun)
A medical condition in which the body's core temperature drops below the level required for normal metabolism. In 1999, Anna Bågenholm survived a record body temperature of 13.7 degrees Celsius after a skiing accident.

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Gossip

Which survival adaptation is the coolest?

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Quiz

What is the medical term for the dramatic slowing of the heart rate that occurs during the dive reflex?

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007skaty The human body uses fever to fight off harmful infections.

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Quiz

Which nerve is responsible for sensing cold water on the face and triggering the mammalian dive reflex?

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007skaty The mammalian dive reflex protects the human body underwater.

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Quiz

What are the fever-inducing chemical substances released by immune cells called?

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Quiz

Why is a moderate fever actually beneficial when your body is fighting off a viral infection?

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Quiz

Approximately how long can the average human survive without food, provided they have access to water?

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Quiz

What alternative energy molecules does the liver produce from fat when glucose is unavailable?

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Quiz

Which endocrine glands, located on top of the kidneys, secrete the adrenaline needed for fight-or-flight?

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Quiz

What physical change occurs during an adrenaline surge to maximize oxygen intake for your muscles?

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