Eating Alive- Part One Flashcards
what is the average capacity of an adult stomach?
about 1 quart (0.94 litres)
what is the first step of digestion in stomach?
thinking of food- saliva and digestive juice start developing
what is the second step of digestion in stomach?
eat food- chewing breaks down food to smallest molecules for best assimilation and absorption
what is the pathway of food to the stomach?
-travels through the esophagus to the stomach
what prevents the food from re entering the esophagus?
cardiac sphincter
explain the gastric juices and food in the stomach?
- gastric juices break down food further for absorption
- some substances are absorbed through the stomach wall
what makes the stomach churn?
many layers of muscle
what does churning help to do?
help to make the acidic digestive juices that digest proteins, and mucous which protects the stomach from its own acid
where does food empty into once it is completely churned?
intestines
what are the 3 functions of the stomach?
- storage
- mixing
- emptying
explain sotrage
stores food that enters from the esophagus
explain mixing
mixes the food particles to separate its nutrient content that forms the bolus
explain emptying
empties bolus into the intestine
food leaves the stomach and enters the intestine through ______ and into the duodenum (first part of small intestine)
pyloric valve
a small duct enters the duodenum just below the stomach where what happens?
bile and enzymes enter from the liver, gallbladder and pancreas
what does bile and enzymes help to do?
- bile helps emulsify fats and lubricate the intestine
- enzymes help digest carbs, proteins and fats
what the mouth and stomach fail to digest , what finishes the job?
pancreatic enzymes
explain the small intestine
- about 20 feet in length
- located in middle of abdominal cavity
what do small microvilli do?
- secrete additional digestive juices to help digest fats, proteins and complex carbs into glucose
- help absorb fat into lymph vessels and other digested nutrients into the veins
what do these veins join to form?
portal vein which carries nutrients to the liver
which valve separates the small intestine to the large intestine?
ileocecal valve
explain the ileocecal valve
stays closed until end of digestion and absorption to prevent micro-organisms from the large intestine entering the small intestine
explain peristalsis?
helps move food into the cecum of the large intestine
how long is large intestine?
5 feet in length
how many types of of micro-organisms in the large intestine which together make up the intestinal flora?
over 400 different types
what do the intestinal flora help in the making of?
some B vitamins, vitamin K, lactic acid, as well aids in peristalsis
what happens when the intestinal flora die?
become the bulk of the stool
what state does the food bolus enter the large intestine in?
liquid state
where does the food bolus travel through?
- through the cecum, to ascending colon, to transverse, to descending colon
- peristalsis helps move the bolus and extracts the liquid
what state is the food bolus by the time it enters the descending colon?
begins to form a hardened stool
where is the liver located and how much does it weigh?
- slightly to the right in the core above and beside the stomach
- weighs around 3 pounds
what is the liver essential in?
sustaining life
what does the liver make and store?
- enzymes
- bile
- glycogen
- vitamins
- minerals
- amino acids
- fats
what does the liver neutralize?
harmful toxins and wastes we are exposed to throughout our lives
the liver has over 500 functions, what are its top 5?
- creating bile to emulsify fats (stored in gallbladder)
- metabolizing hormones, internally produced wastes and foreign chemicals
- synthesizes blood proteins and control and regulation of blood sugar
- filtering everything in the blood
- purifying and clearing waste products, toxins and drugs
what are other functions of the liver?
- regulating and secreting substances important to maintaining body functions and health
- storing important nutrients (such as glycogen glucose), vitamins and minerals
- assimilating and storing fat-soluble vitamins
- metabolizing fats, proteins and carbs
what is the liver capable of doing?
capable of regenerating itself
blood from the intestinal tract filters through what?
through the liver entering through the portal vein from the stomach