Small intestine

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BODY SYSTEMS Organs are classified according to their functions

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Factors Affecting Food Choice

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Digestion 3070

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Digestion

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Small intestine

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Transplant Effects

Short term

Physical Limitations

Dietary Changes

Medication and Monitoring

Recovery Period

Longterm

Quality of Life

Physical Activity

Dietary Management

Health Monitoring

Lifelong Medication

Layers of tissues

Serosa

Muscularis Externa

Submucosa

Mucosa

Interacted Systems

Immune

Nervous

Circulatory

Digestive

Main Function

Absorption of nutrients from digested food.

Consists of three segments: duodenum, jejunum, and ileum.

Villi and microvilli increase surface area for absorption.

Enterocytes absorb nutrients into bloodstream.

Absorbed nutrients include sugars, amino acids, fatty acids, vitamins, and minerals.

Water absorption also occurs in the small intestine.

Interconnected Systems

Circulatory System

Nutrients absorbed into bloodstream through capillaries in small intestine villi.

Circulatory system transports absorbed nutrients to various tissues and organs.

Immune System

Intestinal epithelial cells secrete mucus and produce antimicrobial peptides, aiding immune defense.

Immune system protects digestive system from pathogens and foreign substances.

Diseases

Small Intestinal Parasitic Infections

hookworms

Cryptosporidium

Giardia lamblia

Crohn's disease

Celiac disease