the uptake of substances into or across tissues Absorption the uptake of substances into or across tissues

Carbohydrate Any of a group of organic compounds that includes sugars, starches, celluloses, and gums and serves as a major energy source

Chemical Change where there is a chemical reaction, a new substance is formed

Chemical Digestion the act or process of converting food into chemical substances that can be absorbed and assimilated.

Chemical Energy a form of potential energy related to the structural arrangement of atoms or molecules.

Energy Transformation is the process of energy changing from one form to another.

Enzyme Any of numerous proteins or conjugated proteins produced by living organisms and functioning as biochemical catalysts.

Esophagus the tube that carries food, liquids and saliva from your mouth to the stomach

Large Intestine to transport waste out of the body and to absorb water from the waste before it leaves.

Mechanical Digestion when food is physically broken down

Molecule The smallest particle of a substance that retains the chemical and physical properties of the substance and is composed of two or more.

Peristalsis The wavelike muscular contractions of the alimentary canal or other tubular structures by which contents are forced.

Physical Change A change in matter which does not alter the chemical properties of the matter.

Reproductive System The bodily system of gonads, associated ducts, and external genitals concerned with sexual reproduction

Saliva The watery mixture of secretions from the salivary and oral mucous glands that lubricates chewed food, moistens the oral walls

Small Intestine The narrow, winding, upper part of the intestine where digestion is completed and nutrients are absorbed by the blood.

Stomach The enlarged, saclike portion of the alimentary canal, one of the principal organs of digestion, located in vertebrates between the esophagus and the small intestine.

Thermal Energy kinetic energy due to disordered motions and vibrations of microscopic particles

Alveoli tiny, delicate air sacs deep within the lungs where the gas/blood exchange occurs

Circulatory System The bodily system consisting of the heart, blood vessels, and blood that circulates blood throughout the body, delivers nutrients and other essential materials to cells, and removes waste products

Excretory System The systems that excrete wastes from the body

Integumentary System The bodily system consisting of the skin and its associated structures, such as the hair, nails, sweat glands, and sebaceous.

Kidney Either one of a pair of organs in the dorsal region of the vertebrate abdominal cavity, functioning to maintain.

Respiratory System the system of organs involved in the exchange of carbon dioxide and oxygen between an organism and its environment.