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IMI Phys Ch. 1

The Body as a Whole -- Key Terms

QuestionAnswer
Active transport The transport of substances into or out of a cell using energy.
Adenosine triphosphate (ATP) A compound that stores energy in the muscles. When ATP is broken down during catabolic reactions, it releases energy.
Anabolism Chemical process in the body that join simple compounds to form more complex compounds of carbohydrates, lipids, proteins & nucleic acids. The processes require energy supplied from ATP.
Anatomy The study of the structures of the body and the relationships of its parts.
Apical surface The surface of an epithelial cell that is exposed to the external environment.
Atom The smallest particle of an element that retains and exhibits the properties of that element. Atoms are made up of protons, and electrons.
Atrophy A decrease in the size of a body part or organ caused by a decrease in the size of the cells.
Basal surface The tissue surface that faces the inside of the body.
Basement membrane A permeable membrane that attaches epithelial tissues to the underlying connective tissues.
Carbohydrates Sugars, starches and cellulose composed of carbon, hydrogen and oxygen.
Cardiac muscle fibers Smaller, striated, involuntary muscle fibers (cells) in the heart that contract to pump blood.
Catabolism Chemical processes in the body that release energy as complex compounds are broken down into simpler ones.
Cell The basic structure unit of a living organism. A cell contains a nucleus and cytoplasm and is surrounded by a membrane.
Collagen A protein substance composed of small fibers that combine to create the connective tissue of fasciae, tendons, & ligaments. When combined with water, it forms gelatin. Collagen constitutes approx. 1/4 of the protein in the body.
Collagenous fibers Strong fibers with little capacity for stretch. They have a high degree of tensile strength, which allows them to withstand longitudinal stress.
Connective tissue The most abundant type of tissue in the body, connective tissue supports & holds together the body & its parts, protects the body from foreign matter, & is organized to transport substances throughout the body.
Compound Substances made up of different kinds of atoms.
Cytosol The fluid that surrounds the nucleus or organelles inside the cell membrane.
Cytoplasm Material enclosed by the cell membrane.
Cytoskeleton A framework of proteins inside the cell providing flexibility and strength.
Developmental anatomy How anatomy changes over the life cycle.
Diffusion Movement of ions & molecules from an are of higher concentration to that of a lower concentration.
Deoxyribonucleic acid (DNA) Genetic material of the cell that carries the chemical "blueprint" of the body.
Elastic fibers Connective tissue fibers that are extensible & elastic. They are made of a protein called elastin, which returns to its original length after being stretched.
Element Substance containing only a single kind of atom.
Endocytosis The cellular process of engulfing particles located outside the cell membrane into a cell by forming vesicles.
Endoplasmic reticulum A network of intercellular membranes in the form of tubes that is connected to the nuclear membrane.
Energy The capacity to work. Work is movement or a change in the physical structure of matter.
Epithelial tissues A specialized group of tissues that cover & protect the surface of the body & its parts, line body cavities, & form in areas that move substances into & out of the body during secretion, absorption, & excretion.
Exocytosis The movement of substances out of a cell.
Gross anatomy The study of body structures visible to the naked eye.
High-energy bonds Covalent bonds created in specific organic substrates in the presence of enzymes.
Homeostasis The relatively constant state of the internal environment of the body that is maintained by adaptive responses. Specific control and feedback mechanisms are responsible for adjusting body systems to maintain this state.
Hypertrophy an increase in the size of a cell, which results in an increase in the size of a body part or organ.
Impermeable The quality of not permitting entry of a substance.
Inorganic compounds Chemical structures that do not have carbon & hydrogen atoms as the primary structure.
Interphase The period during which a cell grows and carries on its activities.
Ion pumps Carriers that transport substances into or out of a cell using energy.
Lipids Organic compounds that have carbon, hydrogen, & oxygen atoms but in a different proportion than that of carbohydrates.
Lysosome Cell organelle that is part of the intercellular digestive system.
Matrix The basic substance between the cells of a tissue. Matrix is composed of an amorphous ground substance consisting of molecules that expand when water molecules & electrolytes bind to them. As much as 90% of connective tissue is ground substance.
Meiosis A type of cell division in which each daughter cell receives half the normal number of chromosomes, forming two reproductive cells.
Membrane A thin, sheetlike layer of tissue that covers a cell, an organ, or some other structure; that lines a tube or cavity; or that divides or separates one part from another.
Metabolism Chemical processes in the body that convert food and air into energy to support growth, distribution of nutrients, & elimination of waste.
Metabolites Molecules synthesized or broken down inside the body by chemical reactions.
Microvilli Small projections of the cell membrane that increases the surface area of the cell.
Mitochondria Cell organelles of rod or oval shape that provide energy for cellular activity.
Mitosis Cell division in which the cell duplicates its DNA and divides into two identical daughter cells.
Molecule A combo of two or more atoms. A molecule is the smallest portion of a substance that can exist separately without losing rhe physical & chemical properties of that substance.
Muscle tissue A specialized form of tissue that contracts and shortens to provide movement, maintain posture, & produce heat.
Nervous tissue A specialized tiisue that coordinates and regulates body activity. It can develop more excitability & conductivity than other types of tissue.
Nutrients Essential elements and molecules that are obtained from the diet and that are required by the body for normal body function.
Organelles The basic components of a cell that perform specific functions within the cell.
Organic compounds Substances that have carbon and hydrogen as part of their basic structure.
Osmosis Diffusion of water from a region of lower concentration of solution to a region of higher concentration of solution across the semipermeable membrane of a cell.
Passive transport Transportation of a substance across the cell membrane without the use of energy.
Phagocytosis The process of endocytosis followed by digestion of the vesicle's contents by enzymes present in the cytoplasm.
Phospholipid bilayer Cell membrane made up of lipids, carbohydrates, and proteins.
Physiology The study of the processes and functions of the body involved in supporting life.
Proteins Substances formed from amino acids.
Regional anatomy The study of the structures of a particular area of the body.
Reticular fibers Delicate, connective tissue fibers that occur in networks & support small structures, such as capillaries, nerve fibers, & the basement membrane. Reticular fibers are maade of a specialized type of collagen called reticulin.
Ribonucleic acid (RNA) A type of nucleic acid.
Skeletal muscle fibers Muscle fibers that are neither striated nor voluntary. These muscle cells help regulate blood flow theough the cardiovascular system, propel food through the gut, & squeeze secretions from glands.
Surface anatomy The study of internal organs and structures as they can be recognized and related to external features.
Systemic anatomy The study of the structure of a particular body system.
Tissue A group of similar cells that work together to perform a common function.
Created by: KLCD
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