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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The question asks to fill in blanks about how the endocrine system communicates information to other body regions, including the type of signals, what carries them, the travel pathway, and the possible speed of response.
Option a: Electrical, neurotransmitters, nerves, always fast. This describes neural signaling rather than endocrine signaling. Neurotransmitters are chemical messengers of the nervous system, not the endocrine system, which relies on hormones traveling through the bloodstream. Also, signaling is not always 'always fast' in endocrine communication; hormones can act slowly.
Option b: Chemical or electrical, hormones, the blood, always fast. The endocrine system uses chemical signals called hormones, not electrical signals. Electrical signaling is characteristic of the nervous system, not the endocrine system. Hormones travel through the blood, not the nerves, and their effects are not always fast—they can be slow or fast depending on the hormone and target.
Option c: Chemical, hormones, the blood, fast or slow. This matches the standard understanding: endocrine signaling uses chemical messengers (hormones) that travel via the bloodstream to distant targets, and response times can vary from rapid to slow depending on the hormone, receptor availability, and cellular pathways.
Option d: Exocrine, hormones, ducts, fast or slow. Exocrine refers to glands that release substances through ducts (like salivary or sweat glands), which is not how endocrine signaling operates. Endocrine signaling does not use ducts to deliver hormones; it releases them into the blood, and the term 'exocrine' is not appropriate here.
In summary, option c uniquely aligns with the established concepts of endocrine signaling: chemical hormones traveling through the blood with variable (fast or slow) response times, distinguishing it from neural signaling and exocrine processes.

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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