Small and Large Intestines Parts of the Small
- Slides: 23
Small and Large Intestines
Parts of the Small Intestines
How do the parts of Small intestines Vary? • Duodenum: secretes mucous enzymes and hormones and is a site of entry for bile and pancreatic juices • Jejunum: nutrient absorption • ileum: central portion of the abdominal cavity; p. H 7 -8; absorbs B 12 and bile salts
Intestinal Wall • Mucosa contain: absorptive cells aka: enterocytes • 2 layers of smooth muscle – Circular and longitudinal aid in intestinal mobility • Serosa: supportive CT
Function of villi and microvilli • Specialized absorptive units – Microscopic units with layers of epithelial cells • 200 m 2 for nutrient absorption • desmosomes and tight junctions prevent microbes b/t cells
Regulator of absorptive units • Absorption occurs by active transport, facilitated diffusion, Na/K pump • Actin (protein) • Filaments regulated by autonomic nerve fibers • Fats and water soluble nutrients take different paths
Movement Patterns • Segmentation: circular muscle contraction • Peristalsis: movements by circular and longitudinal muscles
Large Intestines • Colon • 6 cm wide and 1. 5 meets long (6 feet)
Movement of chyme • Chyme enters the colon thru ileocecal valve • Located b/t ileum and colon • Gastroileal reflex regulates ileocecal valve by the peristaltic waves
Major segments of Lg intestines • Transverse • Ascending – Sites of water and Na absorption and mucus secretions • Descending • Sigmoid – Storage of fecal matter
Process that allows for water absorption • Osmosis • …following the Na/K pump which is what type of cellular transport? ?
Important to replenish electrolyte balance • Homeostasis • K is secreted into large intestines
Stool mass What’s in your Poo? • Dietary fiber (pectin and cellulose) • Fruits and vegetables • Indigestible substances
Movements of colon • Segmentation: circular muscle contraction • Peristalsis: movements by circular and longitudinal muscles • Mass movement: force of feces along the colon through the anal canal
Mass movements • Defecation • Rectal distention triggers defecation reflex, which then forces feces out of anal canal • Control? Other mechanisms – Internal and external valves (sphincters) – Pressure from abdominal cavity
Diseases/Disorders • Diverticulitis – Fever, pain in abdomin, diareherra • Possibly caused from increase in intraluminal pressure. • Indiv. With low dietary fiber intake at high risk
Crohn’s Disease • autoimmune disease: caused by the immune system attacking the gastrointestinal tract and producing inflammation in the gastrointestinal tract • may affect any part of the gastrointestinal tract from mouth to anus, • Symptoms: abdominal pain, diarrhea (which may be bloody), vomiting, or weight loss • Type of inflammatory bowel disease (IBD) • appears to be a genetic link • Mutations in the CARD 15 gene
- Orange juice ph
- Mouth esophagus stomach intestines
- Large intestine function in digestive system
- Lower intestines
- A ball rolling down an incline has its minimum speed
- Small medium and large effect sizes
- Fecalyzers
- Large scale vs small scale map
- Effect size f small, medium large
- Cohen's d
- Effect size f small, medium large
- Our cosmic address is
- Definition of scale map
- Scale of a map
- Topographic map of bangladesh
- Geography skills handbook
- Multiplication of scientific notation
- Nobles plication definition
- Esophagus stomach small intestine large intestine
- Function of digestive tract
- Diareherra
- Hát kết hợp bộ gõ cơ thể
- Slidetodoc
- Bổ thể