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what does secretions include?
- saliva
- bile (liver)
- gastric secretions
- pancreatic secretions
- intestinal secretions
what does absorption include?
- in the small intestine
- in the large intestine
does ingestion have to equal excretion?
yes
What is absorption?
take liquid back
what is dehydration?
when you lose too much fluid
how do you get rid of fluid?
- pee
- sweat
- breathing
what is a sphincter/valve?
smooth/skeletal muscle in circular shape around segments of the GI tract
what does it mean when a sphincter/valve contracts?
it is closed
what does it mean when a sphincter/valve relaxed?
it is opened
where is the upper esophageal sphincter located?
between the oral cavity and the esophagus
what is the purpose of the upper esophageal sphincter?
to keep air out
where is the lower esophageal sphincter located?
between the esophagus and the stomach
what is the purpose of low esophageal sphincter?
- prevents gastric juice reflux
- acid reflux is caused by a weakened sphincter
where is the pyloric valve located?
between the stomach and the small intestine
what is the purpose of the pyloric valve?
keeps food in stomach longer and controls how much bile is moved into the small
intestine at one time
where is the sphincter of oddi located?
between the pancreas/liver and the duodenum