Biology

Egg incubation

Processes and strategies by which animals keep eggs warm and protected until embryos develop and hatch, including parental brooding, environmental incubation, artificial incubators

Eggshell

Eicosanoid

Ejaculatory duct

Elastin

Elastin: the elastic protein of connective tissues

Electrology

Electrology: Permanent Hair Removal by Electrolysis

Electron transport chain

Electrophysiology

Electrophysiology: study of electrical activity in cells and tissues

Electroreception

Electroreception: how animals detect electrical fields

Elytra

Elytra: the hardened forewings of beetles

Embalming

Embalming: purpose, methods, history, and cultural considerations

Embioptera

Embioptera (webspinners): silk-producing insects of the tropics and subtropics

Embryo

Embryo — early stage of development in animals, plants, and other organisms

Embryology

ENCODE

ENCODE: The Encyclopedia of DNA Elements — mapping human genome function

Endocardium

Endocardium: structure, development, function, and clinical significance

Endocarp

Endocarp: the innermost layer of a fruit's pericarp

Endocrine gland

Endocrine system

Endocrine system: organs, hormones, functions, and clinical significance

Endometrium

Endometrium: structure, function, and clinical importance

Endoplasmic reticulum

Endoskeleton

Endoskeleton: internal support systems in animals

Endosperm

Endospore

Endosymbiosis

Endosymbiosis: organisms living inside other organisms

Endothelium

Endothelium: the cellular lining of blood and lymphatic vessels

Enkephalin

Enkephalin: endogenous opioid peptides involved in pain and brain signaling

Ensifera

Ensifera: Long-horned orthopterans including crickets and katydids

Entamoeba histolytica

Entamoeba histolytica: biology, disease, diagnosis and prevention

Enteric nervous system

Enteric nervous system (ENS)

Enterobacteriaceae

Enterobacteriaceae: overview of a major family of Gram-negative bacteria

Enterococcus

Enterococcus — biology, habitats, and clinical importance

Enterotype

Enterotype: classification of the human gut microbiome

Enterovirus

Enterovirus: biology, diseases, transmission and public health significance

Entognatha

Entognatha: the entognathous hexapods

Entomology

Entoprocta

Enzyme

Eosinophil granulocyte

Epidermis

Epidermis — the outer cellular layer of plants and animals

Epididymis

Epididymis: structure, function and clinical significance

Epigenetics

Epigynum

Epigynum: the external female genital structure of spiders

Epistasis

Epistaxis

Epithelium

Epithelium: structure, types, functions and clinical significance

Summary of epithelial tissue: cellular arrangement, common types (simple, stratified, pseudostratified), key functions (barrier, secretion, absorption), and clinical relevance incl

Erection

Erection: physiology, types, and clinical considerations

Erythropoietin