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

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

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

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

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

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

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

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

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

10. Mechanical Digestion
when food is physically broken down

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

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

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

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

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

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

17. 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.

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

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

20. 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

21. Excretory System
The systems that excrete wastes from the body

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

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

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