The Digestive System Flashcards
Ingestion/eating
Food is taken in by the body.
Digestion
Food Is broken down
Absorption
Digested food passes into the bloodstream.
Assimilation
Using the food in the cells in the body
Elimination
Getting rid of undigested food
Physical digestion
Taking large pieces of food and braking them down into smaller pieces.
Mouth (teeth)
Stomach(churning)
Enzymes
Are chemicals that speed up reactions without being used up in the reaction
How enzymes work
Act on substrate and breaks it down into a product.
Chemical digestion
Most chemical digestion happens in small intestine
Bile made in liver to break down fats
Pancreas makes digestive juices which contain enzymes
Incisors
At the front of the mouth.
4 upper and 4 lower
Used for biting and cutting food
Canine
One at the either side of the incisors
2 upper 2 lower
Grasp and tear food
Pre molar
3 at the either side of the canine
6upper and 6lower
Grind and crush food
Molars
2 at either side of the premolars
4 upper and 4 lower
Grind and crush food
Herbivore
Only eats plants
Very large incisors
Large molars and premolars to chew grass
E.g. sheep
Carnivore
Only eats meat
Large canine teeth
Use the teeth to catch and tear their prey