Can the heart pump without a brain to begin with? If the heart stops first, is the heart more sensitive to oxygen loss?
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The heart stops first. Think of the heart as a motor, and the brain as a power supply. The motor provides energy to the power supply. Neural tissue can store energy for a short time after its “motor” stops. This is why if someone who has gone into cardiac arrest, if they’re revived soon enough they will be able to avoid brain injury/death.
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