Biology

DNA repair (Damage and Sources) Definition: DNA repair, any of several mechanisms by which a cell maintains the integrity of its genetic code. In human…

Meiosis (Functions and Importance) Definition: Meiosis (/maɪˈoʊsɪs/; from Greek μείωσις, meiosis, which means lessening) is the process in eukaryotic, sexually-reproducing animals that reduces the number…

Meiosis (Phases) Definition: Meiosis (/maɪˈoʊsɪs/; from Greek μείωσις, meiosis, which means lessening) is a specialized form of cell division that produces reproductive cells, such as…

Respiratory System (Anatomy) Definition: The respiratory system (also referred to as the ventilator system) is a complex biological system comprised of several organs that facilitate…

Pulmonary Alveolus Definition: Pulmonary alveolus (plural: alveoli, from Latin alveolus, “little cavity”), informally known as air sac, is any of the innumerable minuscule, thin-walled, capillary-rich…

Epidermis Definition: The epidermis is the outer layer of the three layers that make up the skin, the inner layers being the dermis and hypodermis.…

Metencephalon Definition: Metencephalon is generally considered a part of the brain that largely consists of the brain’s cerebellum and pons. It contains a portion of…

Lymphatic System Definition: Lymphatic System is a collection of organs, tissues, ducts, and vessels that help to make or transport lymph. Lymph is a clear-to-white…

Vitex Peduncularis Plant Vitex is a genus of about 250 species of shrubs and trees from 1-35 m tall, native to tropical, subtropical and also…

Active Transport Definition Active transport is the movement of ions or molecules across a cell membrane in the direction opposite that of diffusion, that is,…

Potassium Channel Definition Potassium channels are designed to allow the flow of potassium ions across the membrane but to block the flow of other ions–in…

Endothelium Definition The endothelium is a thin layer of flat cells lining the closed internal spaces of the body such as the inside of blood…