A hormone is a chemical that is ____.
A) secreted by a gland to the outside world
B) conveyed by the blood to other organs, whose activity it influences
C) capable of activating or inhibiting muscle fibers
D) a feedback message from the postsynaptic neuron to the presynaptic neuron

Question

Quizplus · Accepted Answer

A hormone is a chemical messenger that is secreted by a gland and then transported by the bloodstream to other organs or tissues, where it influences their activity. Option A is incorrect because hormones are secreted into the bloodstream, not to the outside world. Option C is incorrect because hormones do not directly activate or inhibit muscle fibers; instead, they influence the activity of organs and tissues through complex signaling pathways. Option D is incorrect because hormones are not involved in synaptic transmission between neurons; instead, neurotransmitters perform this function.

A Hormone Is a Chemical That Is ____