Digestive System Flashcards
Ingestion?
Combination of mastication by deglutition moving a bolus of food to stomach
Prehension
The process of acquiring food through seizing, grasping or other methods
Digestion
Physiological actions of the stomach and enzymatic breakdown of food to an absorbable form
Absorption
Passage of materials from the lumen of the intestine into the blood stream
Metabolism
Chemical reactions where food components are altered to produce or store energy
Excretion
Process of eliminating waste products of digestion from tissues and organs from the body
Pylorus?
Regulates movement of chyme from stomach to duodenum
Cardia
Area with sphincter that comes above it when food not being swallowed
Fundus
Contains key gastric glands with parietal chief and mucous cells
Pyloric Antrum
Regulates production of hydrochloric acid; secretes gastrin into blood when food present
Gastric Mucosa?
Columnar Epithelium, a thin layer of loose areolar connective tissue and muscle. Thin layer that separates it from the submucosa.
Submucosa
Comprised of dense, irregular, connective tissue separating it from mucosa. Contains blood and lymphatic vessels and nerves which supply the mucosa.
Muscular Externa
Region of muscle responsible for peristaltic movements of the stomach. Comprised of three layers.
Order of muscle layers in stomach?
- Longitudinal
- Circular
- Oblique
Order of muscle layers in stomach?
- Longitudinal
- Circular
- Oblique
Longitudinal
Generates peristaltic movement contractions moving food through the stomach
Oblique
Churns and breaks down the bolus of food
Circular
Mixes bolus of food via forceful, grinding contractions, moving it to the duodenum
Goblet Cells
Produce mucus from stomach wall to protect against auto digestion
Parietal Cells
Produces HCl from stomach wall, lowering pH so pepsin can break down protein
Chief Cells
Produces pepsinogen which when combined with Hal converts to pepsin to break down protein
HCl?
Hydrochloric Acid
Which hormone is responsible for stimulating the parietal cells to produce Hydrochloric Acid?
Gastrin
The mix of partly digested food and secretions from the stomach is referred to as?
Chyme
Chyme?
Product in the stomach following food material breakdown, food enters the stomach at gastric pits within gastric lining secrete various gastric juices.