Studied by 6 peopleHow many functions does digestive system have
3
What are the three main function of digestive system
Taking in and breaking food in smaller pieces
absorption of nutrients
excretion of wastes
What are the two types of digestion
mechanical and chemical digestion
What is mechanical digestion
food is breaken down by grinding action of teeth and squeezing of muscles
What is chemical digestion
food is breaken down by actions of chemicals like hydrochloric acid and enzymes like saliva
What are the 4 stages of digestion
ingestiondigestionabsorptionegestion
What is ingestion?
mounth and teeth grind food peristalis (muscular contractions) help push food down esophagus
What is peristalsis?
smooth musclemuscular contractions which help to push food down the esophagus
What is digestion?
stomach turns solid food into chyme (liquid goop) and sends it to the small intestine
Absorption in small intestine
most nutrients are absorbed in the small intestine and sent to blood stream
What is egestion?
waste material is sent to large intestine where it is absorbed. final waste products (feces) is released through anus.
What does the mouth/oral cavity do
breaks down food (mechanical digestion)chewing Saliva produced by epithelial tissue (chemical digestion)
What does the pharynx (throat) do?
connects to the esophagus Epiglottis (flap) covers the trachae to prevent food going down the breathing tube
What is the epiglottis?
a flap that flips down to cover the entry to the trachea during swallowing
What does the esophagus do?
connects mouth to stomach smooth muscle contracts and relaxes to push food to stomach (called peristalis)
what is peristalis
smooth muscle contracts and relaxes to push food to stomach
What does the stomach do
holds food physical digestion (muscles churn food) chemical digestion (hydrochloric acid and enzymes break down food and bacteria)
How much food can the stomach hold?
2 liter
What type of digestion takes place in stomach
Physical digestion: muscles churn food Chemical digestion: hydrochloric acid and enzymes break down food and kill harmful parasites
What does the small intestine do?
chemical digestion and absorption
What types of digestion happen in small intestine
chemical digestion
How are nutrients absorbed in small intestine
absorbed through the intestine walls and into blood stream
How long is the small intestine?
23 feet long
What is the small intestine lined with?
microvilli
What parts are the large intestine
has 3 parts colon
What does the large intestine do?
water absorption storage of feces removing feces
What are the accessory organs?
liver
What doe the accessory organs do
provide digestive enzymes that help break down food
What is the liver?
large reddish-brown organ that helps with digestion; located on the left side of digestive system
What is the pancreas?
just behind your stomach During digestion
What is the gallbladder?
a small organ on the left side
What is the role of the digestive system
to supply body with fuel to participate in physical activity
Timing and quantity of the digestive system
digestion takes time to begin and complete do not consme a lot of food bc it will not have digested to supply energy
Note
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