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Respiration Exchange of respiratory gases (oxygen and carbon dioxide) between an
organism and its environment
Digestion process by which complex food products are broken down into simpler
substances that can be absorbed and used by individual body cells
Absorption movement of molecules, such as respiratory gases or digested nutrients,
through a membrane and into the body fluids for transport to cells for use
Secretion production and release of important substances, such as digestive juices and
hormones, for diverse body functions
Excretion removal of waste products from the body
Circulation movement of body fluids containing many substances from one body area to
another in a continuous, circular route through hollow vessels
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Reproduction formation of new individual offspring
autopoiesis living organisms are self-organizing or self-maintaining and nonliving
structures are not.
cell theory any independent structure made up of one or more microscopic units called
cells is a living organism
metabolism each characteristic of life is related to the sum total of all the physical and
chemical reactions occurring in the body
levels of organization atom--molecule--macromolecules--organelle--cell--tissue--organ--
organ system--organism
atom tiny spheres of matter, every material thing in the universe, including the human
body is composed of atoms. Combinations of atoms form larger chemical groupings
molecules combos of atoms that form larger chemical groupings
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macromolecules molecules in combination with other atoms form these larger and more
complex chemicals
cytoplasm atoms, molecules and macromolecules in living material form this gel like
material made of fluids, particles and membranes--the essential material of human life
organelles a structure made of molecules organized in such a way that it can perform a
specific function. Tiny organs that all each cell to live. Cannot survive outside the cell, but
without organelles the cell could not survive.
Types of organelles Mitochondria-power house of cells that provide energy needed by the
cell to carry out day-to-day functioning, growth and repair.
Golgi apparatus-set of sacs that provide "packaging" service to cells by storing material for
future internal use or for export from the cell
Endoplasmic Reticulum--network of channels within the cell that act as "highways" for the
movement of chemicals and as sites for chemical processing