digestive system Flashcards
what is the digestive system made up of
Alimentary Canal (GI tract):
tube extending from mouth to anus
includes the mouth, pharynx, esophagus, stomach, small & large intestine
DIGESTIVE SYSTEM FUNCTION
- Digestion: process of physically/chemically breaking food into nutrients for the cells”
- Eliminate solid wastes from the body
6 BASIC PROCESSES IN DIGESTION ISMDAD
Ingestion
Secretion
Mixing and propulsion
Digestion - mechanical and chemical
Absorption
Defecation
1 BIG STEP OF DIGESTIVE PROCESS
- Food enters mouth
Broken down by teeth
taste w taste buds
saliva secrets from salivary glands moistens food & starts chemical digestion
2 BIG STEP OF DIGESTIVE PROCESS
- Food formed into bolus
pushed into pharynx by tongue (swallowed)
muscles of pharynx push bolus into esophagus
food travel through esophagus to stomach by peristalsis by muscles of esophagus
3 BIG STEP OF DIGESTIVE PROCESS
- Food broken down into smaller pieces in stomach physically by churning by muscular action of stomach
chemically by gastric juices (acid) secreted by stomach lining
Semi-liquid chyme is formed
4 BIG STEP OF DIGESTIVE PROCESS
- Peristalsis pushes
food from stomach into
small intestine
5 BIG STEP OF DIGESTIVE PROCESS
Remaining chyme, undigested nutrients, and waste move into colon (large bowel, large intestine)
ascending, transverse, descending colon
most of the water & electrolytes is absorbed from chyme
remaining waste products of digestion called feces
includes solid wastes, some water, micro-organisms, and mucus
6 BIG STEP OF DIGESTIVE PROCESS
- Peristalsis will push the feces from the colon to the rectum
stores feces until defecation (BM)
7 BIG STEP OF DIGESTIVE PROCESS
- Feces will leave body through the
anus
opening to outside
anal sphincter (muscle ring)
feces excreted is called stool
2 SPHINCTERS
Lower Esophageal Sphincter (LES)
prevents food coming back from stomach into esophagus.
Pyloric Sphincter
between stomach and small intestines -controls how much food goes into stomach.
SMALL
INTESTINE
Lined with villi
3 parts of the small intestine:
1. Duodenum
digestive juices (bile & pancreatic enzymes) added to chyme to help chemically break food down further
2. Jejunum
3. Ileum
Most absorption of nutrients happens in jejunum and ileum
Functions of the Liver
- Metabolizes (breaks down) fats, proteins, and carbohydrates
- Detoxifies blood
- Stores fat-soluble vitamins
- Produces bile, cholesterol, and bilirubin
Bile helps digest fat, absorb fat-soluble vitamins, and gives stool brown color
Bile stored in gall bladder until needed for digestion
Function of the Pancreas
Adds other digestive juices
Insulin is produced by beta cells
Pancreas also produces:
amylase, break down of carbohydrates
Lipase, break down of fats
Proteases, breaks down protein
NORMAL CHANGES WITH AGING IN DIGESTIVE SYSTEM
Decrease in saliva production
Difficulty swallowing
Decrease in appetite
Decrease in secretion of digestive juices
Ingestion
Peristalsis slows, constipation
what to observe in digestive system
appetite
ability to chew and swallow (related to CNS)
pain/dyspepsia
emesis
bloating
bowel sounds (sounds as peristalsis occurs)
BM – frequency, amount, shape/consistency, colour, odour
report changes
Characteristics of Normal Stool
Brown in colour
Soft formed (shaped like rectum); moist
Affected by hydration
Affected by speed of movement through GI tract
Characteristic odor
Characteristics of Abnormal Stool
Bright red, fresh blood (lower bowel)
Black, tarry stool, older blood (may be from higher in GI system)
Colour may be due to foods/medications
Clay coloured: indicates liver disease
Infections/ pathogens may cause other colours e.g. greenish
Diarrhea
Frequent liquid stools
S/S: abdo cramping, n&v, dehydration
Causes: infections, medications, food, etc.
TX: diet, medications (must be done with nurse supervision)
Diarrhea – HCA Role
Encourage hydration
Follow standard precautions
Skin care
Help clients to bathroom promptly
Consider safety
Observe and report
Document
Fecal
Incontinence
Inability to control passage of feces and gas through anus
Many causes:
intestinal or nervous system disease
diarrhea
medications
delayed help in getting to the bedpan, commode, BR
HCA role in Fecal Incontinence
Promote normal defecation
Assist client to toilet as requested
May need a bowel training plan
Bowel Training
Process of developing a regular pattern of defecation
Two goals:
To gain control of bowel movement
To prevent fecal impaction, constipation, fecal incontinence
Bowel Training hca role
Toilet client as per care plan or when client requests to have BM
Follow guidelines to promote normal defecation
Privacy
safety
positioning
Suppository may be given to stimulate a BM (check scope)