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Flashcards - NES General Science: Reproduction & Development

Flashcards - NES General Science: Reproduction & Development
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ectoderm
Ectoderm is one of the three primary germ layers in the very early embryo
endoderm
Endoderm is one of the three primary germ layers in the very early human embryo
mesoderm
In all bilaterian animals, the mesoderm is one of the three primary germ layers in the very early embryo
zygote
A zygote , is a eukaryotic cell formed by a fertilization event between two gametes
seminiferous tubules
Seminiferous tubules are located within the testes, and are the specific location of meiosis, and the subsequent creation of male gametes, namely spermatozoa
ovulation
Ovulation is the release of egg from the ovaries
ovum
The egg cell, or ovum, is the female reproductive cell in oogamous organisms
chorion
In humans and most mammals, the chorion is one of the membranes that exist during pregnancy between the developing fetus and mother
uterus
The uterus or womb is a major female hormone-responsive reproductive sex organ of most mammals, including humans
zona pellucida
The zona pellucida is a glycoprotein layer surrounding the plasma membrane of mammalian oocytes
allantois
Allantois is a sac-like structure that forms part of a developing amniote's conceptus
amnion
The amnion is a membrane that closely covers the embryo when first formed
yolk sac
The yolk sac is a membranous sac attached to an embryo, formed by cells of the hypoblast adjacent to the embryonic disk
gene expression
Gene expression is the process by which information from a gene is used in the synthesis of a functional gene product
acrosome
The acrosome is an organelle that develops over the anterior half of the head in the spermatozoa of many animals
blastocyst
The blastocyst is a structure formed in the early development of mammals
morula
A morula is an early stage embryo consisting of cells in a solid ball contained within the zona pellucida
intervillous space
In human embryology, intervillous space is the "space between the villi containing the vessels" of the mother and the embryo
gastrula
Gastrulation is a phase early in the embryonic development of most animals, during which the single-layered blastula is reorganized into a trilaminar structure known as the gastrula
primary germ layers
A germ layer is a primary layer of cells that form during embryogenesis
ligand
In coordination chemistry, a ligand is an ion or molecule that binds to a central metal atom to form a coordination complex
organogenesis
In animal development, organogenesis is the process by which the ectoderm, endoderm, and mesoderm develop into the internal organs of the organism
flagellum
A flagellum is a lash-like appendage that protrudes from the cell body of certain prokaryotic and eukaryotic cells

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