Mitochondria oocytes

Mitochondria are present in all eukaryotic cells that use oxygen in respiration, but the number per cell and the form and size vary.1-4 Certain tiny trypanosomes have just one mitochondrion but some oocytes have as many as 3 x 105. Mammalian cells typically contain several hundred mitochondria and liver cells5 more than 1000. Mammalian sperm cells may contain 50-75 mitochondria,6 but in some organisms only one very large helical mitochondrion, formed by the fusion of many individual mitochondria, wraps around the base of the tail. Typical mitochondria appear to be about the size of cells of E. coli. However, study of ultrathin serial sections of a single yeast cell by electron microscopy has shown that, under some growth conditions, all of the mitochondria are interconnected.7... 

Mitochondria are present in all eukaryotic cells that use oxygen in respiration, but the number per cell and the form and size vary. Certain tiny trypanosomes have just one mitochondrion but some oocytes have as many as 3 x 10 . Mammalian cells typically contain several himdred mitochondria and liver cells more than 1000. Mammalian sperm cells may contain... 

Yolk granule enlargement leads ultimately to the formation of a yolk body with regular geometric shape and an internal structure with well-marked crystal-like periodicity. Ward (1962b) has shown that the yolk body produced in this way consists of protein, but whether the raw materials for yolk formation are synthesized within the mitochondrion itself, or are simply assembled from phosphoproteins synthesized elsewhere and then transported to the oocyte via the bloodstream (Flick-inger and Rounds, 1956 Wallace and Dumont, 1968), is not known. In view of the limited synthetic capacities of mitochondria, it seems likely that the function of the mitochondrion in yolk formation is primarily one of assembly. 

D) Mitochondrion with cristae, tubuli, and vesicles. Interstitial cell (Leydig cell) of the differentiated rat testis. Close spatial relationship with the endoplasmic reticulum (X). 1 36,000. (E) Mitochondrion with few cristae arranged in a typical way and fine granular matrix. Oocyte of a primary follicle (rabbit). 1 36,000. (F). Mitochondria with numerous tubuli and vesicles and with an electron dense matrix. Zona fasciculata of the suprarenal gland (adult rat). 1 36,000,... 

---