Digestive System 1 Flashcards
Four stages of digestion
Ingestion
Digestion
Absorption
Egestion
Ingestion
Taking in of food into the digestive system
Digestion
Breakdown of food physically and chemically
Absorption
Occurs when digested food passes from the digestive system and enters the blood
Egestion
Removal of unabsorbed waste from digestive system
Types of teeth
Incisors
Canines
Premolars
Molars
Mechanical digestion
Takes place in the mouth by the chewing and grinding action of teeth on food
Chemical digestion
Occurs in the mouth by the action of enzyme amylase.
Amylase is found in salivary, which is a fluid produced by 3 pairs of salivary glands
What is the dental formula
2(I 2/2 C 1/1 P 2/2 M3/3)
Functions of digestive system
Oesophagus Stomach Small intestine Large Cilli Single villus Liver
Oesophagus
Muscular tube connecting pharynx to the stomach
Peristalsis
Mines food down the oesophagus
Stomach
Muscular bag
Churns and mixed food with gastric acid forming chyme
What does the stomach do
Digests food
How long does the stomach form food
4 hours
How long is small intestine
5-6m
Functions of small intestine
Digestion
Absorption
What are the 3 parts of the small intestine
Duodenum
Jejunum
Ileum
Where does digestion occur
Duodenum
What absorbs nutrients
Jejunum
Ileum
What does the large intestine do
Feeds off your waste
Function of colon
Produce b group vitamins
Digests cellulose
What do the caecum, appendix and rectum do
Store faeces
Villi
Increases surface area for absorption of digested food
Where are all digested foods absorbed
Into blood vessels
What does the liver produce
Bike
What does the liver break down
Toxins
Where does bile enter the duodenum
Through the bile duct
What does bile consist of? 3 things
Water
Bile salts
Bile pigments
Functions of the liver
Emulsisphies fats
Neautralizes the acidic chyme from stomach
If it ends in ‘ose’ it is a..
Sugar
Name the digestive enzymes
Salivary amylase
Pepsin
Lipase
What does salivary amylase digest
Starch
Where is salivary amylase produces
Salivary glands
Where does salivary amylase act
The mouth
What does pepsin digest
Protein
Where is pepsin produced
Gastric glands in stomach
Where does pepsin act
Stomach
What does lipase digest
Fat
Lipase is producer in the
Pancreas
Lipase acts on
Duodenum
