What is eco system? What hormone that detect when someone is in shock?

An ecosystem is a community of living organisms in conjunction with the nonliving components of their environment, interacting as a system. These biotic and abiotic components are linked together through nutrient cycles and energy flows.

Shock is a defense response

The hormone released is adrenaline

But the body also releases the hormone (chemical) adrenaline and this can reverse the body's initial response. When this happens, the blood pressure drops, which can be fatal.

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