Examlex
What is defined as the minimum amount of energy required to initiate a chemical reaction?
Hormones
Chemical messengers produced by the endocrine glands in the body, transported in the bloodstream to target organs to regulate physiology and behavior.
Endocrine System
The body system that helps regulate metabolic activities; consists of ductless glands and tissues that secrete hormones.
Nervous System
The system composed of neurons and their extensions that is responsible for sending signals throughout the body.
Second Messenger
Intracellular signaling molecules released by the cell to trigger physiological changes in response to external signals.
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