Presented by the Stomach (Primarily...)

Stores _____________ (human capacity is ____________) This is the site of early _____________ digestion “J”-shaped It does not absorb _________________

◦ The nutrients are still too large Only absorbs:

◦ Water◦ Glucose◦ Salts◦ Alcohol

These things will pass through the stomach membrane into the _____________________

This chemical and physical digestion changes the food bolus into a liquefied paste called _________________

___________________◦ Secretes ___________________ (HCl) for two

purposes HCl destroys ________________in food HCl converts ________________into pepsin

This enzyme digests proteins into amino acids

___________________◦ Secretes ___________________

___________________◦ Secretes ___________________

This protects the stomach lining so no __________occur

_______________________________◦ Regulates the movement of foods and stomach

acids from stomach to small intestines

Main function of the small intestines is to _______________ nutrients◦ The “small” in the small intestines refers to the

___________________, NOT the length◦ It is approximately ____ long in humans

Shorter in carnivores, longer in herbivores

There are three parts to the small intestine1. ________________________• It’s about 0.3m long• The majority of digestion occurs here

2. ________________________• It’s about 2.7m long

3. ________________________• It’s about 4 m long

Its secretions play a large role in digestion It secretes two products:

1. ___________________________________ This is released into the pancreatic duct It is a ____________solution, meaning that it will neutralize

the stomach acid pH becomes 9 (neut. HCl), deactivates pepsin

It also contains some digestive ___________________ Amylase (converts carbs to sugars) Lipase (converts lipids to fatty acids and glycerol) Trypsin (converts proteins to amino acids)

2. ___________________________________ This is release directly into the bloodstream It regulates _________________________ levels

____________________________________________ ____________________________________________

To maintain health, your body must keep certain conditions constant or within an acceptable range

Regulating blood-sugar levels is one example of this

While watching Bill Nye, please try to answer all the questions on the page

There are some on the back!!

Enjoy – I am still trying to download all of Magic School Bus