Any compound composed of atoms (some of which are carbon) held together by covalent (shared electron) bonds
A part of the body formed of two or more tissues and adapted to carry out a specific function; e.g. the stomach
Steroid found in animal fats as wells as in most body tissues; made by the liver
Epithelium (epithelial tissue)
Pertaining to a primary tissue that covers the body surface, lines its internal cavities, and forms glands
Synthesis (combination) reaction
A chemical reaction in which larger, more complex atoms or molecules are formed from simpler ones
Negative feedback mechanisms
The most common of homeostatic control mechanisms. The net effect is that the output of the system shuts off the original stimulus or reduces its intensity.
Energy stored in the bonds of chemical substances
Process in which water is used to split a substance into smaller particles.
Organ specialized to secrete or excrete substances for further use in the body or for elimination
Non-symmetrical molecules that contain electrically unbalanced atoms
Organic Compound composed of carbon, hydrogen, and oxygen; includes starches, sugars, cellulose.
System consisting of lymphatic vessels, lymph nodes, and other lymphoid organs and tissues; drains excess tissue fluid from the extracellular space and provides a site for immune surveillance.
RNA (Ribonucleic Acid)
Nucleic acid that contains ribose and the bases A,G,C, and U. Carries out DNA's instructions for protein synthesis.
The chromosomes, X and y, that determine genetic sex (XX=femal, XY=male); the 23rd pair of chromosomes
Fats and oils composed of fatty acids and glycerol; are the body's most concentrated source of energy fuel; also known as neutral fats.
Cancer causing agent
A homogeneous mixture of two or more components
Transverse (horizontal) section
A plane running from right to left, dividing the body into superior and inferior parts
The number of protons in an atom
The symbol for hydrogen ion concentration; a measure of relative acidity or alkalinity of a solution
Pertaining to a position near the tail end of the long axis of the body.
The spreading of particles in a gas or solution with a movement toward uniform distribution of particles.
1. A cell or nerve ending of a sensory neuron specialized to respond to particular types of stimuli 2.) Molecule that binds specifically with other molecules e.g. neurotransmitters, hormones, and antigens.
A longitudinal (vertical) plane that divides the body or any of its parts into right and left portions.
A chain of amino acids
White, semi-opaque connective tissue
Atomic Mass Number
Sum of the number of protons and neutrons in the nucleus of an atom.
Ionic compound that dissociates into charged particles (other than hydrogen or hydroxyl ions) when dissolved in water.
Chemical reaction in which a molecule is broken down into smaller molecules or its constituent atoms.
System of protection and support composed primarily of bone and cartilage.
Midsagittal (median) section
Specific sagittal plane that lies exactly in the midline.
Nonliving material that separates the living cells in connective tissue consisting of ground substance and fibers.
(1) A thin layer or flat plate: (2) the portion of a vertebra between the transverse process and the spinous process.
Band of regular fibrous tissue that connects bones.
Organ, gland, or muscle capable of being activated by nerve endings.
Structures in the nucleus that carry the hereditary factors (genes).
Control center of a cell; contains genetic material.
Below normal tone or tension
A group of similar cells (and their intercellular substance) specialized to perform a specific function; primary tissue types of the body are epithelial, connective, muscle, and nervous tissue.
Main carbohydrate stored in animal cells; a polysaccharide.
Excessive, above normal, tone or tension.
A substance capable of binding with hydrogen ions; a proton acceptor.
Substance composed of two or more different elements, the atoms of which are chemically united.
Pertaining to the skull.
Principal blood sugar; a hexose.
Frontal (coronal) section
Longitudinal (vertical) plane that divides the body into anterior and posterior parts.
The shriveling of a cell, for example an erythrocyte, resulting from loss of water.
The substance that is dissolved in a solution.
A substance that releases hydrogen ions when in solution (compare with Base); a proton donor.
System primarily responsible for water, electrolyte, and acid-base balance and removal of nitrogenous wastes.
Membrane, composed of three lamina layers, that encloses cell contents; outer limiting cell membrane.
Portion of the body between the diaphragm and the pelvis
Anything that occupies space and has mass.
Building block of nucleic acids; consists of a sugar, a nitrogen-containing base, and a phosphate group.
A muscle cell.
Engulfing of extracellular fluid by cells.
The cellular material surrounding the nucleus and enclosed by the plasma membrane.
Pertaining to the front; anterior.
The capacity to do work; may be stored (potential energy) or in action (kinetic energy).
Process by which a large molecule is synthesized by covalently bonding smaller molecules together
The front of an organism, organ, or part; the ventral surface.
Refers to the chest.
Chemical bond formed by electron transfer between atoms.
Difference in hydrostatic pressure that drives filtration
The energy directly involved in moving matter; e.g., in bicycle riding, the legs provide the mechanical energy that moves the pedals.
Organelles that originate from the Golgi apparatus and contain strong digestive enzymes.
Class of organic molecules that includes DNA and RNA.
Energy formed by the movement of charged particles across cell membranes.
Away from the midline of the body.
A malignant, invasive cellular neoplasm that has the capability of spreading throughout the body or body parts.
Small cellular structures (ribosomes, mitochondria, and others) that perform specific metabolic functions for the cell as a whole.
Elimination of waste products from the body.
Region of the diencephalon forming the floor of the third ventricle of the brain.
The smallest part of an element; indivisible by ordinary chemical means.
The living animal (or plant), which represents the sum total of all its organ systems working together to maintain life.
Minute body found near the nucleus of the cell; active in cell division.
Adenosine triphosphate (ATP)
Organic molecule that stores and releases chemical energy for use in body cells.
Particle consisting of two or more atoms joined together by chemical bonds.
Membrane transport processes that do not require cellular energy (ATP), e.g., diffusion, which is driven by kinetic energy.
Abnormal accumulation of fluid in body parts or tissues; causes swelling.
Reduction in size or wasting away of an organ or cell resulting from disease or lack of use.
Study of the function of living organisms.
Toward the attached end of a limb or the origin of a structure.
Isotope that exhibits radioactive behavior.
Fluid within a cell.
Ability to respond to a stimulus.
DNA Deoxyribonucleic acid)
A nucleic acid found in all living cells; it carries the organism's hereditary information.
Engulfing of foreign solids by (phagocytic) cells.
Membrane transport processes for which ATP is provided, e.g., solute pumping and endocytosis.
An energy relationship holding atoms together; involves the interaction of electrons.
Toward the midline of the body.
Long, whiplike extension of the plasma membrane of some bacteria and a sperm; propel the cell.
Complex substance containing carbon, oxygen, hydrogen, and nitrogen; composes 10% to 30% of cell mass.
Group of chemical substances including certain hormones and cholesterol; they are fat soluble and contain little oxygen.
pertaining to the cheek
An abnormal mass of proliferating cells; benign _____ remain localized; malignant _____ are cancers, which can spread to other organs.
Chemical substances, such as salts, acids, and bases, that ionize and dissociate in water and are capable of conducting an electrical current.
The structural and functional unit of living organisms; contains a nucleus and a variety of organelles enclosed by a limiting membrane.
The process of spontaneous decay seen in some of the heavier isotopes, during which particles or energy is emitted from the atomic nucleus; results in the atom becoming more stable
Extracellular material consisting of a basal lamina secreted by epithelial cells and a reticular lamina secreted by underlying connective tissue cells.
Away from the attached end of a limb or the origin of a structure.
Chemical bond created by electron sharing between atoms.
Exchange (displacement) reaction
Chemical reaction in which bonds are both made and broken; atoms become combined with different atoms.
A primary tissue; form and function vary extensively. Functions include support, storage, and protection.
One of the seven bones that form the ankle and heel.
Linear chains of carbon and hydrogen atoms (hydrocarbon chains) with an organic acid group at one end. A constituent of fat.
Different atomic forms of the same element, vary only in the number of neutrons they contain; the heavier species tend to be radioactive.
The average of the mass numbers of all the isotopes of an element.
Study of the structure of living organisms.
Process in which molecules are formed, changed, or broken down.
Cytoplasmic organelles responsible for ATP generation for cellular activities.
Individual cells (unicellular glands) that produce mucus.
Positive feedback mechanisms
Feedback that tends to cause the level of a variable to change in the same direction as an initial change.
Chemical substances that do not contain carbon, including water, salts, and many acids and bases.
The energy of motion or movement, e.g., the constant movement of atoms, or the push given to a swinging door that sets it into motion.
Literally, one sugar; building block of carbohydrates; e.g., glucose.
One of the eight bones of the wrist.
A modified simple sugar (a sugar alcohol).
Fluid between the cells.
The organ system consisting of the skeletal muscles of the body and their connective tissue attachments.
Tiny projections on the free surfaces of some epithelial cells; increase surface area for absorption.
Body system that includes internal organs that secrete hormones.
Modified lipid containing phosphorus
Pertaining to the arm.
Radiant (electromagnetic) energy
Energy form that travels in waves.
Refers to the neck or the necklike portion of an organ or structure.
Literally, many sugars, a polymer of linked monosaccharides; e.g., starch, glycogen.
Negatively charged subatomic particle; orbits the atom's nucleus.
The spread of cancer from one body part or organ into another not directly connected to it.
Organic compound containing nitrogen, carbon, hydrogen, and oxygen; building block of protein.
Outermost electron shell (energy level) of an atom that contains electrons.
Subatomic particle that bears a positive charge; located in the atomic nucleus.
Organic compound formed of carbon, hydrogen, and oxygen; examples are fats and cholesterol.
Atom with a positive or negative electric charge.
Cytoplasmic organelles at which proteins are synthesized.
The one- or two-letter symbol used to indicate an element; usually the first letter(s) of the element's name
Literally, double sugar; e.g., sucrose, lactose.
Dense spherical bodies in the cell nucleus involved with ribosomal subunit synthesis and storage.
One of a limited number of unique varieties of matter that composes substances of all kinds; e.g., carbon, hydrogen, oxygen.
Weak bond in which a hydrogen atom forms a bridge between two electron-hungry atoms. An important intramolecular bond.
The division of cytoplasm that occurs after the cell nucleus has divided.
Uncharged subatomic particle; found in the atomic nucleus.
Process during which the chromosomes are redistributed to two daughter nuclei; nuclear division. Consists of prophase, metaphase, anaphase, and telophase.
Nonsymmetrical molecules that contain electrically unbalanced atoms.
Pertaining to the groin region.
A group of organs that work together to perform a vital body function; e.g., the nervous system.
Diffusion of a solvent through a membrane from a dilute solution into a more concentrated one.
Epithelium (epithelial tissue)
Pertaining to a primary tissue that covers the body surface, lines its internal cavities, and forms glands.
Barlike bodies of tightly coiled chromatin; visible during cell division.
Cord of dense fibrous tissue attaching muscle to bone
A state of body equilibrium or stable internal environment of the body.
One of the biological units of heredity located in chromatin; transmits hereditary information.
Lesion or erosion of the mucous membrane, such as gastric ulcer of stomach.
Membranes that form the linings of body cavities open to the exterior (digestive, respiratory, urinary, and reproductive tracts).
Tiny, smooth muscles attached to hair follicles; cause the hair to stand upright when activated.
Life threatening; pertains to neoplasms that spread and lead to death, such as cancer
Membrane that lines a cavity without an opening to the outside of the body (except for joint cavities); serosa
A sticky, thick fluid secreted by mucous glands and mucous membranes; keeps the free surface of membranes moist.
Double-layered capsule composed of an outer fibrous capsule lined by synovial membrane; encloses the joint cavity of a synovial joint.
Sebaceous glands (oil glands)
Epidermal glands that produce an oily secretion called sebum.
Water-soluble protein found in the epidermis, hair, and nails that makes those structures hard and water-repellent; precursor is keratohyalin.
Clear, watery fluid secreted by cells of a serous membrane.
Membrane that lines the capsule of a synovial joint.
Oily secretion of sebaceous glands.
(1) flat, scalelike; (2) pertaining to flat, thin cells that form the free surface of some epithelial tissues.
Inflammatory disease of the skin; infection of the sebaceous glands.
Serous membrane lining the interior of the abdominal cavity and covering the surfaces of abdominal organs.
The less numerous type of sweat gland; produces a secretion containing water, salts, proteins,and fatty acids.
Epidermal gland that produces sweat.
Overzealous immune response to an otherwise harmless antigen.
Layer of skin deep to the epidermis; composed of dense irregular tissue.
Two-layered serous membrane that lines the thoracic cavity and covers the external surface of the lung.
Skin and its derivatives; provides the external protective covering of the body.
Superficial layer of the skin; composed of keratinized stratified squamous epithelium.
Dark pigment formed by cells called melanocytes; imparts color to skin and hair.
Glands that have ducts through which their secretions are carried to a particular site.
The skin; composed of epidermal and dermal layers.
A cell that produces melanin.
Sudoriferous gland - Epidermal gland that produces sweat.
An inflammation of the skin; nonspecific skin allergies.
Beneath the skin.