Nervous coordination overview — A/L Biology

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1. How does hormonal coordination differ fundamentally from nervous coordination in the human body?
   1. A) Hormonal signals travel much faster than saltatory nerve impulses
   2. B) Nervous responses have wide systemic dissemination through the lymphatic system
   3. C) Hormonal responses are generally slower to initiate and longer-lasting, transported via blood
   4. D) Hormonal responses are strictly electrical and restricted to localized target cells
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   Correct answer: C) Hormonal responses are generally slower to initiate and longer-lasting, transported via blood

   Nervous coordination operates via rapid electrochemical action potentials targeted directly along axons, producing brief, localized effects. Hormonal coordination involves chemical messengers secreted into the bloodstream, producing slower, widespread, and prolonged physiological responses.

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   Step 1: Compare signaling channels: Nervous = nerve fibers (fast, point-to-point); Endocrine = bloodstream (slower, distributed). Step 2: Compare duration: Nervous = transient/immediate; Endocrine = sustained/long-lasting. Step 3: Option 1 correctly contrasts both mechanisms. Answer: Hormonal responses are generally slower to initiate and longer-lasting, transported via blood.
   Modelled on: the A/L Biology examination pattern

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Where does Nervous coordination overview fit in the syllabus?

Year 2 · Term 1