Biology
Articles about living organisms, life processes and biological research.
Lipid bilayer
Lipid bilayer: structure, formation, and biological roles
Lipopolysaccharide
Lipopolysaccharide (LPS): structure, function, and medical importance
Lissamphibia
Litoria
Liver
Liver (hepatic organ)
Living fossil
Local extinction
Locomotion
Locomotion: movement and mechanisms in animals, microbes and machines
Longevity
Lophophore
Lophophore: the ciliated tentacle feeding organ of lophophorate animals
Lophotrochozoa
Loricifera
Loricifera — tiny loricate animals of marine sediments
Lufengosaurus
Lufengosaurus — Early Jurassic sauropodomorph from China
Lung
Lung: structure, function, development and importance
The lung is the primary respiratory organ in most vertebrates. This article explains its structure, how breathing and gas exchange work, evolutionary origins, and why lungs matter
Luria–Delbrück experiment
Luria–Delbrück experiment (Fluctuation Test)
Luteinizing hormone
Luteinizing hormone (LH)
Lycoperdon umbrinum
Lycoperdon umbrinum — the umber-brown puffball
Lycopsis
Lycopsis — extinct Miocene South American metatherian carnivore
Lymph node
Lymphatic system
Lymphatic system: structure, roles, and clinical relevance
Lymphocyte
Lysis
Lysis: rupture of cell membranes or walls causing cell death
Lysosome
Lysosome: cellular digestive organelle and recycling center
Lysozyme
Macrococcus
Macroevolution
Macrolepidoptera
Macrolepidoptera: overview, composition, and significance
Macrophage
Macrophage: tissue phagocyte and immune regulator
Major histocompatibility complex
Malacology
Mammaliaformes
Mammalogy
Mammary gland
Mandible
Mandible (lower jaw)
Mantle (mollusc)
Mantle (mollusc anatomy)
Marine biology
Marine biology: the study of life in the oceans
Mast cell
Mast cell: tissue-resident immune cell involved in allergy, defense and repair
Mast cells are tissue-resident leukocytes formed in bone marrow that store histamine and other mediators. They mediate allergic reactions, fight parasites, aid wound healing, and i
Mating
Mating: Biological reproduction, mechanisms and behaviors
Maxilla
Mayfly
Mayfly (Order Ephemeroptera): life cycle, features, and ecological importance
Mecoptera
Mecoptera: scorpionflies, hangingflies, and related long-rostrum insects
Medulla oblongata
Medulla oblongata: structure, functions, and clinical importance
The medulla oblongata is the lowermost brainstem segment that links brain and spinal cord and houses vital centers controlling breathing, circulation and reflexes.
Medusa (biology)
Megavirus
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Meiosis
Meiosis: reduction division, stages, and role in sexual reproduction
Meiosis is a specialized cell division that halves chromosome number to produce gametes, creating genetic diversity through recombination and independent assortment and enabling se
Melanin
Melanin: pigment, production, functions, and clinical significance