Sperm Flagella TEM

Motile sperm cells typically move via flagella and require a water medium in order to swim toward the egg for fertilization. Most of the energy for sperm motility is derived from the metabolism of fructose carried in the seminal fluid. This takes place in the mitochondria located in the sperm’s midpiece (at the base of the sperm head). These cells cannot swim backwards due to the nature of their propulsion.  (from wikipedia)

photo credit David Phillips (link).  Image found at Post-mitotic tumblr

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