Endodermis
The innermost layer of the cortex in plant roots; a cylinder one cell thick that forms the
boundary between the cortex and the stele.
Endogenous
Arising from internal structures or functional causes.
Endomembrane system
The collection of membranes inside and around a eukaryotic cell, related either through
direct physical contact or by the transfer of membranous vesicles.
Endometrium
The inner lining of the uterus, which is richly supplied with blood vessels.
Endonucleases
Endonucleases are enzymes that cleave the phosphodiester bond within a polynucleotide
chain.
Endoparasites
A parasite, such as a tapeworm, that lives within another organism.
Endoplasmic reticulum
An extensive membranous network in eukaryotic cells, continuous with the outer nuclear
membrane and composed of ribosome-studded (rough) and ribosome-free (smooth)
regions.
Endorphin
A hormone produced in the brain and anterior pituitary that inhibits pain perception.
Endoskeleton
A hard skeleton buried within the soft tissues of an animal, such as the spicules of sponges,
the plates of echinoderms, and the bony skeletons of vertebrates.
Endosperm
A nutrient-rich tissue formed by the union of a sperm cell with two polar nuclei during
double fertilization, which provides nourishment to the developing embryo in angiosperm
seeds.
Endospore
A thick-coated, resistant cell produced within a bacterial cell exposed to harsh conditions.
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