Flashcards in Digestive Deck (39):
What does the digestive system break food down into and then absorb into the blood stream?
What is the digestive system regulated by?
parasympathetic nervous system
Saliva does what?
cleans mouth and dissolves food into bolus
Saliva contains enzymes to start the digestion of what macro nutrient?
Salivary glands secrete how much saliva per day?
more than a liter
Which salivary gland contain enzymes to break down carbs?
Which salivary glands contain mostly serous cells? mucous cells?
parotid and submandibular have mostly serous cells
sublingual secrete mostly mucus
Which macro nutrient does the stomach digest?
What's the function of the stomach?
to change bolus into chyme
What kind of glands are gastric glands in the gastric pits?
What do parietal glands in the stomach secrete?
What does hydrochloric acid active?
pepsinogen & intrinsic factor
What do chief cells secrete in the stomach?
What is intrinsic factor needed to absorb?
vitamin b12 - which is needed for RBC production
What is the pH of gastric juice?
What substances are absorbed in the stomach lining?
alcohol and asprin
How long are the small intestines?
15 feet long (1-7-7)
How long does chyme stay in the small intestines?
What's the function of the small intestines?
major site of chemical digestion & where nutrients are absorbed
What macro nutrient is digested in the duodenum?
What glands are active in the duodenum and what is neutralized here?
pancreas and gallbladder; hydrochloric acid
What is the jejunum's function?
chemical digestion and absorption of nutrients
What is Ileum rich in?
What is contact digestion?
chyme is broken down by touching the sides which contain villi
What do brush boarder enzymes do?
complete the digestion of carbs and proteins
How long do substances stay in the large intestine?
What things make up feces? (3)
undigested material, dead epithelial cells, bacteria
How long is the large intestine?
5 feet long (cecum to anal canal)
What's the function of the large intestine? (2)
absorbs water and electrolytes, forms and expells feces (not much digestion here)
What does the liver produce?
What does the liver store?
glycogen and fat soluble vitamins
What does the liver do to blood?
Where is bile stored?
Gastric emptying is under control of which part of the digestive tract?
What is the endocrine function of the pancreas?
control blood sugar levels (via insulin and glucagon)
What is the exocrine function of the pancreas?
produces and secretes digestive enzymes
How long does food stay in the stomach?
How often is the lining of the stomach renewed?
every 3 days