Ovum

Ovum manusa

Ovum (atawa sacara bébas, endog atawa sél endog) nyaéta sél kelamin/séks bikang/wanoja atanapi gamét. Boh sato atawa siki tatangkalan mibanda endog. Istilah ovule dipaké pikeun endog siki tutuwuhan sarta pikeun endog ngora sato. Kecap ieu diturunkeun tina kecap Latin ovum (loba ova) pikeun endog.

Dina sato nu leuwih luhur, endog dihasilkeun ku organ nu disebut ovarium. Dina sato ovipar (sadaya manuk, kalolobaan lauk, amfibi, jeung réptil) endogna tumuwuhkeun lapisan panyalindungan nu dibawa ngaliwatan oviduk ka luar awak. Endog ieu dibuahan ku spérma jalu boh di jero (kawas manuk) atawa saluareun awak bikangna (kawas lauk). Satutasna dibuahan, lajeng tumuwuh émbrio, nu kaparaban ku gizi nu dikandung ku endog. It then hatches from the egg, outside the mother's body. See egg (biology) for a discussion of eggs of oviparous animals.

In the viviparous animals (which include humans and all other placental mammals), the ovum is fertilized inside the female body, and the embryo then develops inside the uterus until it is born. It receives nutrition directly from the mother. The ovum is the largest cell in the human body, typically visible to the naked eye without the aid of a microscope or other magnification device.

There is an intermediate form, the ovoviviparous animals: the embryo develops within and is nourished by an egg as in the oviparous case, but then it hatches inside the mother's body shortly before birth, or just after the egg leaves the mother's body. Some fish, reptiles and many invertebrates use this technique.

Tempo ogé

• endog (biologi)
• fértilisasi
• inseminasi
• ovulasi
• polinasi
• reuneuh
• spérma