The basic unit of structure and function in a living thing.
Cell Membrane
The outside boundary of a cell.
Nucleus
The control center of the cell that directs the cell's activities and contains information that determines the cell's characteristics.
Cytoplasam
The area in a cell between the cell membrane and the nucleus.
Tissue
A group of similar cells that perform the same function.
Muscle Tissue
A body tissue that contracts or shortens, making body parts move.
Nerve Tissue
A body tissue that carries messages back and forth between the brain and every otherp art of the body.
Connective Tissue
A body tissue that provides support for the body and connects all of its parts.
Epithelial Tissue
A body tissue that covers the surfaces of the body, inside and out.
Organ
A structure in the body that is composed of different kinds of tissue.
Oragn System
A group of organs that work together to perform a major function in the body.
Digestion
The process by which the body breaks down food into small nutrient molecules.
Absorption
The process by which nutrient molecules pass through the wall of the digestive system into the blood.
Saliva
The fluid released when the mouth waters that plays an important role in both mechanical and chemical digestion.
Enzyme
A protein that speeds up chemical reactions in the body.
Epiglottis
A flap of tissue that seals off the windpipe and prevents food from entering.
Esophagus
A muscular tube that connects the mouth to the stomache.
Mucus
A thick slippery substance produced by the body.
Peristalsis
Involuntary waves of muscle contraction that keep food moving along in one direction through the digestive system.
Stomach
A J-Shaped muscular pouch located in the abdomen that expends to hold all of the food that is swallowed.
Small intestine
The part of the digestive system in which most chemical digestion takes place.
Liver
The largest and heaviest organ inside the body.
Bile
A substance produced by the liver that breaks up fat particles.
Gallbladder
The organ that store bile after it is produced by the liver.
Pancreas
A triangulat organ that produces enzymes that flow into the small intestine.
Villus
Tiny-finger shaped structures that cover the inner surface of the small intestine and provides a large surface area through which digested food is absorbed.
Large intestine
The last section of the digestive system, where water is absorbed from food and the remaining material is eliminated from the body.
Rectum
A short tube at the end of the large intestine where watse material is compressed into a solid form beffore being eliminated
Anus
A muscular opening at the end of the rectum through which digestive waste material is eliminated from the body.
