F. colour SEM of sperm being capacitated in uterus

F. colour SEM of sperm being capacitated in uterus

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Credit: PROFESSORS P.M. MOTTA & J. VAN BLERKOM/ SCIENCE PHOTO LIBRARY

Caption: Capacitation of spermatozoa. False-colour scanning electron micrograph of a spermatozoon floating over the endometrium, the internal wall of the uterus. Thanks to their movements through the ciliated epithelium (light orange) spermatozoa undergo a process known as capacitation. During this phase, which lasts about seven hours, a glycoprotein coat and seminal plasma proteins are removed from the heads of spermatozoa. This enables a spermatozoon, when close to the egg, to release special enzymes which allows it to penetrate the surrounding membranes of the egg. Magnification: x5060 at 6x7cm size. x7140 at 4x5".

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Keywords: anatomy, capacitation, capacitation of sperm, endometrium, human body, in uterus, reproduction, reproductive system, sperm, sperm in uterus, spermatozoa, uterus

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