Mitochondria
Videos
A mitochondrion is an organelle found in the cells of most eukaryotes, such as animals, plants and fungi. Mitochondria have a double membrane structure and use aerobic respiration to generate adenosin
Cross-sectional image of cristae in a rat liver mitochondrion to demonstrate the likely 3D structure and relationship to the inner membrane
Transmission electron micrograph of a chondrocyte, stained for calcium, showing its nucleus (N) and mitochondria (M)
Typical mitochondrial network (green) in two human cells (HeLa cells)
Sperm
Videos
Sperm is the male reproductive cell, or gamete, in anisogamous forms of sexual reproduction. Sperm cells contribute approximately half of the nuclear genetic information to the diploid offspring. Anim
Motile sperm cell attempting to penetrate an ovum's coating to fertilize it.
Electron micrograph of human spermatozoa magnified 3140 times.
Human sperm stained for semen quality testing