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The Digestive System
Digestive system vocabulary
39
Science
7th Grade
03/27/2007

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Term
nutrient
Definition
substances in the foods that provide energy and materials for cell development, growth & repair
Term
nutrition
Definition
science of how food affects the function of living organisms
Term
carbohydrate
Definition
a nutrient that is the main source of energy
Term
protein
Definition
a nutrient needed for growth and repair of body cells; also, as enzymes
Term
lipids
Definition
a nutrient which provides stored energy
Term
minerals
Definition
inorganic nutrients that regulate chemical reactions in the body
Term
vitamins
Definition
organic nutrients needed to help your body use other nutrients
Term
digestion
Definition
the process of breaking down food into small molecules so that the nutrients can be absorbed by the cell
Term
mechanical digestion
Definition
breaking food down into smaller particles by chewing, churning, or bile
Term
enzymes
Definition
a protein that speeds up chemical reactions in the cell
Term
saliva
Definition
watery substance produced in the mouth that begins the chemical digestion of food
Term
peristalsis
Definition
wavelength muscle contractions that propel food through the digestive tract
Term
amylase
Definition
an enzyme in saliva that starts the breakdown of starch into sugar
Term
pepsin
Definition
an enzyme in the stomach that helps break proteins into amino acids
Term
villi
Definition
tiny, finger-like projections on the inner surface of the small intestine
Term
absorption
Definition
the movement of nutrient molecules into blood vessels
Term
I'm a muscular tube that squeezes the food down to the stomach.
Definition
esophagus
Term
I'm the entrance to the food tube. I chew the food up well.
Definition
the mouth
Term
Waste exits from my opening.
Definition
the anus
Term
Final digestion takes place in my 20-foot-long tube.
Definition
small intestine
Term
I store the solid waste and remove the water.
Definition
large intestine
Term
We make chemicals to help break down the food.
Definition
the liver and the pancreas
Term
I'm the first part of the small intestine. Food enters me after it leaves the stomach.
Definition
duodenum
Term
Where are nutrients absorbed into the bloodstream?
Definition
small intestine
Term
Where food is moistened and enzymes are produced to break down food
Definition
salivary glands
Term
Where food is churned and acid is produced to break down the food
Definition
stomach
Term
Produces bile
Definition
liver
Term
stores bile
Definition
gall bladder
Term
the passageway for food from mouth to stomach
Definition
esophagus
Term
The site where digestion begins in the body.
Definition
the mouth
Term
Which nutrients are your main source of energy?
Definition
carbohydrates
Term
Which group of substances are needed to help your body use other nutrients?
Definition
vitamins
Term
Inorganic nutrients that regulate chemical reactions (ex: iron, calcium)
Definition
minerals
Term
What substance dissolves nutrients?
Definition
water
Term
Which nutrients provide stored energy?
Definition
lipids
Term
Which nutrients are needed for cell growth and repair?
Definition
proteins
Term
Which enzyme breaks down starch into sugar?
Definition
amylase
Term
Which enzyme breaks down starch into sugar?
Definition
amylase
Term
The muscle contractions that move food through the digestive system are called ____.
Definition
peristalsis
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