oil (oyl) a fat in a liquid state (p. 22) oogamy (oh-og'uh-mee) sexual reproduction in which the female gamete, or egg, is nonmotile and larger than the male gamete, or sperm, which is motile (p. 332) oogonium (pl. oogonia) (oh-oh-goh'nee-um; pl. oh-oh-goh'nee-ah) a female sex organ of certain algae and fungi; it consists of a single cell that contains one to several eggs (p. 332, 351)

operculum (oh-per'kyu-lum) the lid or cap that protects the peristome of a moss sporangium (p. 391) orbital (or'buh-till) a volume of space in which a given electron occurs 90% of the time (p. 15) order (or'dur) a category of classification between a class and a family (p. 290) organelle (or-guh-nel') a membrane-bound body in the cytoplasm of a cell; there are several kinds, each with a specific function (e.g., mitochondrion, chloro-plast)1 (p. 32) organic (or-gan'ik) pertaining to or derived from living organisms and pertaining to the chemistry of carbon-containing compounds (p. 21) osmosis (oz-moh'sis) the diffusion of water or other solvents through a differentially permeable membrane from a region of higher concentration to a region of lower concentration (p. 156) osmotic potential (oz-mot'ik puh-ten'shil) potential pressure that can be developed by a solution separated from pure water by a differentially permeable membrane (the pressure required to prevent osmosis from taking place) (p. 157) osmotic pressure (oz-mot'ik presh'ur) see osmotic potential outcrossing (out'kross-ing) cross-pollination between individuals of the same species (p. 258) ovary (oh'vuh-ree) the enlarged basal portion of a pistil that contains an ovule or ovules and usually develops into a fruit (p. 133)

ovule (oh'vyool) a structure of seed plants that contains a female gametophyte and has the potential to develop into a seed (p. 133, 422) oxidation-reduction reactions (ok-suh-day'shun ree-duk'shun) chemical reactions involving gain or loss of electrons to or from a compound (p. 172)

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Essentials of Human Physiology

Essentials of Human Physiology

This ebook provides an introductory explanation of the workings of the human body, with an effort to draw connections between the body systems and explain their interdependencies. A framework for the book is homeostasis and how the body maintains balance within each system. This is intended as a first introduction to physiology for a college-level course.

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