2.3 energy and waste Flashcards
what ingestion is when you put food in your mouth.
ingestion
where does the mechanical and chemical begin.
when you put food in your mouth
the amount of energy in food is measured in calories.
calorie
the amount of energy it takes to raise the temperature of 1 kg of water by 1 c.
calorie
releases the energy from the processed food.
your digestive system
the parts of food used by the body to grow and survive
nutrients
5 examples of nutrients
proteins, fats, carbohydrates, vitamins, and minerals
the mechanical and chemical breakdown of food into small particles and molecules that your body can absorb and use.
digestion
The 4 steps of digestion
ingestion, digestion, absorption, and elimination.
when you chew, mash, and grind food with your teeth and tongue
mechanical digestion
break down pieces of food into small molecules
chemical digestion
when you put food, such as bread, into your mouth
ingestion
an enzyme, in your mouth, that helps break down carbohydrates.
saliva
a muscular tube that connects the mouth to the stomach
esophagus
food moves through the esophagus and the rest of the digestive tract by waves of muscle contractions.
peristalsis
a large, hollow organ that stores food.
stomach.
An adult stomach can hold about of food and liquid
2 liters
enable the stomach to expand and hold large amounts of food
the folds on the inner walls
the cells in these folds produce chemicals that help break down
proteins
this stomach fluid makes the stomach acidic
gastric juice
an enzyme that helps break down the proteins in foods into amino acids
pepsin
a long tube that is connected to the stomach. it is about 23 ft long
small intestine
finger like projects that cover the folds of the small intestine
villi
nutrients enter the blood through the vessels in this digestive organ
small intestine
