zona cartilaginea - definição. O que é zona cartilaginea. Significado, conceito
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O que (quem) é zona cartilaginea - definição

GLYCOPROTEIN LAYER SURROUNDING THE PLASMA MEMBRANE OF MAMMALIAN OOCYTES
Zona pallucida; Zona Pellucida; Zona pelucida; Zona striata; Zonae pellucidae; Zona striate; Zona pellucida glycoprotein; Zona pellucidum; Zona pellucidus; Sperm-binding protein; Area pellucida

Zóna A         
SLOVAK PUNK ROCK BAND
Zona A
Zóna A is a Slovak punk rock band formed in 1984 in Bratislava. The lead vocalist Peter "Koňýk" Schredl is the only co-founder who is still in the band.
Zona reticularis         
  • adrenal gland (zona reticularis layer).
LAYER OF ADRENAL CORTEX
Zona reticulosa; Reticularis; Zona reticulata
The zona reticularis (sometimes, reticulate zone) is the innermost layer of the adrenal cortex, lying deep to the zona fasciculata and superficial to the adrenal medulla. The cells are arranged cords that project in different directions giving a net-like appearance (L.
Zona Boêmia         
HUMAN SETTLEMENT IN BRAZIL
Zona Boemia
The Zona Boêmia is a region in the commercial centre of Belo Horizonte, Brazil, noted for its abundancy of bars, brothels, sex theatres and motels, and many consider it the city's red light district.

Wikipédia

Zona pellucida

The zona pellucida (plural zonae pellucidae, also egg coat or pellucid zone) is a specialized extracellular matrix that surrounds the plasma membrane of mammalian oocytes. It is a vital constitutive part of the oocyte. The zona pellucida first appears in unilaminar primary oocytes. It is secreted by both the oocyte and the ovarian follicles. The zona pellucida is surrounded by the corona radiata. The corona is composed of cells that care for the egg when it is emitted from the ovary.

This structure binds spermatozoa, and is required to initiate the acrosome reaction. In the mouse (the best characterised mammalian system), the zona glycoprotein, ZP3, is responsible for sperm binding, adhering to proteins on the sperm plasma membrane. ZP3 is then involved in the induction of the acrosome reaction, whereby a spermatozoon releases the contents of the acrosomal vesicle. The exact characterisation of what occurs in other species has become more complicated as further zona proteins have been identified.

In humans, five days after the fertilization, the blastocyst performs zona hatching; the zona pellucida degenerates and decomposes, to be replaced by the underlying layer of trophoblastic cells. The zona pellucida is essential for oocyte growth and fertilization.