What is a hormone?

A. A chemical regulator secreted from an endocrine gland that travels through the bloodstream to affect target cells
B. A chemical released from an endocrine gland that affects target cells without entering the bloodstream
C. A chemical found in the blood that catalyzes the destruction of ingested toxins and foreign substances
D. A chemical found in the sweat that signals other individuals about the physiological status of the body
E. A chemical released from a nerve cell that affects nearby cells across a synapse


Answer: A

Anatomy & Physiology

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The route of major parasympathetic outflow from the head is via the ________.

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