3.1.4 - Internal pacemakers and external zeitgebers

3.1.4 The role of internal pacemakers (body clock) and external zeitgebers in the regulation of the circadian sleep-wake cycle.

Use - internal pacemakers and external zeitgebers to connect the rule to the data and decision in the question.

This matters because - internal pacemakers and external zeitgebers determines what can be inferred or chosen; begin with the stated conditions and keep the conclusion tied to the evidence.

Example: apply - internal pacemakers and external zeitgebers to one small, clearly defined case, show the key step or comparison, and explain the result in words.

Boundary: - Internal pacemakers and external zeitgebers is not a universal recommendation. Check the syllabus scope, assumptions, units and the limits of the evidence before generalising.