The endocrine system uses ____ signals called ___ to communicate to convey information to other regions of the body. These signals travel through ___ and the response time is_____.[Fill in the blank]

Question

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The question asks about how the endocrine system communicates information to other regions of the body, including the type of signals, the messengers, the travel pathway, and the variability in response time.
Option a: 'Electrical, neurotransmitters, nerves, always fast.' This describes neural communication, not endocrine signaling. Endocrine signals are not primarily electrical, they are chemical hormones, and they travel through the bloodstream, not along nerves. Also, the response is not always fast; hormonal effects can be slower or longer-lasting.
Option b: 'Chemical or electrical, hormones, the blood, always fast.' This overstates the modality by suggesting electrical signaling in addition to chemical, which is not typical for the endocrine system. While hormones travel through the blood, the phrase 'always fast' is incorrect because endocrine responses can be slow to start and long-lasting, depending on the hormone and target tissue.
Option c: 'Chemical, hormones, the blood, fast or slow.' This matches the classic description: endocrine signaling uses chemical messengers called hormones, which are released into the bloodstream (the blood) to reach distant organs; the response time can be fast or slow depending on the hormone and context. This option correctly aligns with established physiology.
Option d: 'Exocrine, hormones, ducts, fast or slow.' This describes exocrine signaling (through ducts) rather than endocrine signaling (which uses the bloodstream). Since the question is about endocrine communication, this option is incorrect on multiple counts.

The endocrine system uses __ signals called _ to communicate to convey information to other regions of the body. These signals travel through _ and the response time is___.[Fill in the blank]

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