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#thermotaxis

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Fertilization in mammals-l

Mammalian sperm move towards warmer regions due to:

Thermotaxis describes directed movement of capacitated sperm toward warmer temperatures. In female tract temperature rises from cooler sperm reservoir in isthmus toward warmer fertilization site in ampulla after ovulation, creating gradient approximately two degrees. Sperm sense this via thermosensitive TRP channels and opsin-mediated signaling triggering calcium influx that modulates flagellar curvature biasing direction up gradient. Behavior requires capacitation and functional CatSper. By moving toward heat, sperm efficiently ascend tract narrowing search area, complementing rheotaxis and chemotaxis for locating ovulated oocyte within limited viable window, enhancing fertility, conception success and fertilization efficiency.

Ref: Speroff & Fritz, Clinical Gynecologic Endocrinology: Thermotaxis gradients and sperm navigation toward ampullary warmth.

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Fertilization in mammals-ll

Thermotaxis refers to sperm migration towards:

Thermotaxis enables sperm to detect subtle temperature gradients along female tract and migrate toward warmer regions. Ovulation raises ampullary temperature by approximately two degrees compared to cooler isthmic reservoir where sperm are stored. Sperm express thermosensitive channels including TRP family members and rhodopsin that translate thermal cues into intracellular calcium pulses altering flagellar bending. Directed movement toward warmth guides sperm over centimeters toward recently ovulated oocyte, bridging gap between long-range rheotaxis and short-range chemotaxis during narrow reproductive window for effective fertilization and conception success.

Ref: Gilbert, Developmental Biology, 12th ed., Chapter 7: Thermotaxis and sperm migration toward warmer oviductal gradients.

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