hce_kmu
105年
普通生物及生化概論
第 17 題
The primary difference between estrous and menstrual cycles is that:
- A most estrous cycles are of much longer duration compared to menstrual cycles.
- B behavioral changes during estrous cycles are much less apparent than those of menstrual cycles.
- C season and climate have less pronounced effects on estrous cycles than they do on menstrual cycles.
- D copulation normally occurs across the estrous cycle, whereas in menstrual cycles copulation only occurs during the period surrounding ovulation.
- E the endometrium shed by the uterus during the estrous cycle is reabsorbed, whereas the shed endometrium of menstrual cycles is excreted from the body.
思路引導 VIP
請試著思考:當一個生物體耗費大量能量建立了一層肥沃的子宮組織,若最後沒有受精,從「資源回收」與「廢棄排泄」的角度來看,大自然中有哪些可能的處理方式?而我們在日常觀察中,除了人類以外的其他多數哺乳動物,是否常看到如月經般的出血現象?
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AI 詳解
AI 專屬家教
同學做得好!你能精準辨析出這兩者生理機制上的核心差異,顯示你對哺乳動物生殖系統的觀念掌握得非常紮實。
子宮內膜的能量策略
在生物學上,發情週期 (estrous cycle) 與 月經週期 (menstrual cycle) 最本質的區別在於子宮內膜的處理方式。在發情週期中,若未受孕,增厚的子宮內膜會被母體重新吸收 (reabsorbed),這是一種節約能量與資源的演化策略;相對地,月經週期(僅見於人類及部分靈長類)則是將未使用的內膜組織隨血液排出體外 (excreted)。這正是區分這兩者最關鍵的解剖生理特徵。
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