Hormones are best described as
Correct answer: C. chemical messengers carried in the blood to target organs
- A. enzymes that speed up metabolism
- B. waste products of the endocrine glands
- C. chemical messengers carried in the blood to target organs
- D. electrical signals sent along nerves
Explanation
Endocrine glands secrete hormones directly into the blood, which delivers them everywhere, but only cells with the right receptors respond. This slow, widespread chemical signalling complements the fast, wired signalling of the nervous system.
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About Receptors
Receptors are specialized cells or proteins that detect stimuli such as light, sound, pressure, temperature and chemicals, then initiate responses through sensory or hormonal pathways. Questions distinguish sensory receptors from effectors, compare receptor types, and examine stimulus conversion into nerve impulses, including the roles of rods, cones, chemoreceptors and mechanoreceptors.
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