DIGESTION Flashcards Preview

BIO DEATH #1 > DIGESTION > Flashcards

Flashcards in DIGESTION Deck (22)
Loading flashcards...
1

4 stages of processing nutirents

ingestion
digestion
absorption
eleimination

2

ingestion

eating

3

digestion

sequential process of breaking down into smaller pieces/parts at the end of digestion, left with small absorbable molecules.

4

absorption

cells take up amino acids, sugars, fatty acids

5

elimination

undigested material passes out of digestive system

6

Intracellular digestion

particles taken in by phagocytosis or pinocytosis (small organisms)

7

extracellular digestion

occurs in specialized compartments that are contiguous with outside of the body.
ex. gizzard, Gastric ceca.

8

first 10 seconds

oral cavity, pharynx and esophagus
food triggers saliva
mucin coats/protects oral cavity
antibacterial agents
peristalisis-waves of coordinated muscular contractions move the food bolus to the stomach in an involuntary fashion

9

Stomach 2-6 hours

stores food and begins the chemical digestive process
protein digestion
can hold about 2L of food
contents are mixed with gastric juice about every 30 sec. to digest food.
both exit and entry closed off by sphincters

10

Ulcers

when the protection beaks down in the lining of the stomach

11

digestion

life in the proximal small intestine
duodenum
jejunum
lleum

12

duodenum (25-30cm)

most of enzymatic hydrolysis and nutrient absorption is here
pH~6

13

jejunum (2.5m)

contributes to the nutrient and water absorption
pH~7-8

14

lleum (2-4m)

primarily absorbs vitamin B12, bile salts and anything the jejunum missed.
pH~7-8

15

Villi

large number of folds in the lining of the intestine
epithelial cells have microvilli
nutrients absorbed goes straight to the circulatory system

16

Absorption Elimination

the large intestine, colon, and anus

17

Colon

reclaims water

18

rectum

stores feces until their elimination through the anus

19

appendix

helps restore bacteria in colon
function in immune response

20

alimentary canal

mouth
esophagus
stomach

21

trypsin

breaks down proteins into smaller peptides

22

peristalsis

smooth muscle contractions that move food along the esophagus