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caption

Scanning electron micrograph (SEM) of a sperm on the surface of a human egg (ovum) during fertilization. The egg has a furry surface which attracts sperm. The sperm's tail enables it to swim and reach the female ovum. The head is capped by the acrosome that releases enzymes that assist in the penetration of the egg during fertilization. Only a single sperm succeeds in fertilization. Rapid chemical changes thicken the outer membrane surrounding the ovum and form a barrier to competing sperm. Once fertilized, the egg begins the process of cell division.

headline Science Source Feb 2010

created date 2010-02-13

credit EAST NEWS

source Science Source

byline Don W. Fawcett

original transmission reference 9e1280

weight 2,71MB

size 34cm x 43cm by 300dpi

keywords - Show

ACROSOME, AND, ASSIST, ATTRACTS, BARRIER, BEGINS, BY, CAPPED, CELL, CELLULAR, CHANGES, CHEMICAL, COMPETING, CONCEPTION, DIVISION, DON, DURING, E, EGG, ELECTRON, ENABLES, ENZYMES, FAWCETT, FEMALE, FERTILIZATION, FERTILIZE, FERTILIZED, FERTILIZING, FORM, FURRY, HAS, HEAD, HISTOLOGICAL, HISTOLOGY, HUMAN, IMAGING, IN, IS, IT, MEDICAL, MEMBRANE, MICROGRAPH, MICROGRAPHY, MICROSCOPY, OF, ON, ONCE, ONLY, OUTER, OVUM, PENETRATION, PROCESS, RAPID, REACH, RELEASES, REPRODUCTION, REPRODUCTIVE, SCANNING, SCIENCE, SEM, SINGLE, SPERM, SUCCEEDS, SURFACE, SURROUNDING, SWIM, SYSTEM, TAIL, THAT, THE, THICKEN, TO, WHICH,