Ilustration of a human sperm fertilizing

Ilustration of a human sperm fertilizing

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Credit: FRANCIS LEROY, BIOCOSMOS/SCIENCE PHOTO LIBRARY

Caption: Illustration of a human sperm fertilising an egg. The picture shows the size difference between the egg, or ovum, & the spermatozoon. Human spermatozoa are extremely elongated single cells about 65 micrometres long, divided into 3 main regions: a head, neck, & tail. The head, which contains the male nucleus, is about 7 micrometres long. Here, the head appears buried in the follicular cells, which form the corona radiata that surrounds the ovum. Beneath the corona radiata is a glycoprotein membrane, the zona pellucida, which the sperm must penetrate to reach the female nucleus.

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Keywords: anatomy, artwork, fertilisation, fertilization, human body, images, magnified image, microscopic photos, ovum, reproduction, sperm, subjects

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