Chapter 6 Outline

Nutrition

  • Proteins are “foremost”
  • Lipids are required for all membranes and are the principal storage compounds of animals
  • Carbohydrates are low in abundance in many animals but highly abundant when they play structural roles
  • Vitamins are essential organic compounds required in small amounts
  • Elemental nutrition: Many minerals are essential nutrients

Feeding

  • Many animals feed on organisms that are individually attacked and ingested
  • Suspension feeding is common in aquatic animals
  • Symbioses with microbes often play key roles in animal feeding and nutrition
  • BOX 6.1 A Genomic Discovery: The Gut Microbiome
  • BOX 6.2 Types of Meal Processing Systems

Digestion and Absorption

  • Vertebrates, arthropods, and molluscs represent three important digestive–absorptive plans
  • Digestion is carried out by specific enzymes operating in three spatial contexts
  • BOX 6.3 The Digestive Systems of Arthropods and Bivalve Molluscs
  • Absorption occurs by different mechanisms for hydrophilic and hydrophobic molecules

Responses to Eating

The Control of Hunger and Satiation

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