Which of the following best describes homeorhesis?

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BlackTom AI · Accepted Answer

When approaching the concept of homeorhesis, it helps to distinguish it from related ideas like homeostasis. Homeostasis refers to maintaining a stable internal environment, whereas homeorhesis describes the orchestrated, coordinated changes the organism undergoes to support a particular physiological state or developmental trajectory.
Option 1: 'Rapid response to environmental stressors' suggests an immediate, possibly transient reaction. While organisms can respond rapidly to stress, homeorhesis is not primarily about a quick reaction to stress; it’s about coordinated changes that facilitate a transition to a specific state.
Option 2: 'Short-term physiological adjustments' implies adjustments over a brief period without implying coordination toward a stable state. Homeorhesis is more about the structured, integrated shift needed to support a particular physiological phase, which is broader than a fleeting adjustment.
Option 3: 'Maintenance of a steady internal state' describes homeostasis, the goal of keeping the internal environment constant. This is the opposite of what homeorhesis emphasizes, which is the coordinated change to reach a new state rather than staying constant.
Option 4: 'Coordinated changes in metabolism to support a physiological state' accurately captures the essence of homeorhesis: the body reorganizes metabolic processes in a synchronized way to sustain a specific functional state (such as growth, lactation, or aging-related transitions).
In summary, the correct idea centers on integrated metabolic reorganization to enable a chosen physiological condition, whereas the other options describe rapid stress responses, short-term tweaks, or maintenance of constancy rather than coordinated state-supporting changes.

ANSC20002_2025_SM2 Mid Semester exam

Which of the following best describes homeorhesis?

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