Nutrition, Digestion, Absorption, and Nitrogen Excretion Adaptations for Feeding Heterotrophic organisms can be classified by how they acquire their nutrition. Decomposers , mostly protists and fungi, absorb nutrients from dead organic matter.
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Figure 50.10 The Human Digestive System
Figure 50.9 Greater Intestinal Surface Area Means More Nutrient Absorption (Part 3)
Figure 50.11 Tissue Layers of the Vertebrate Gut
Figure 50.12 Swallowing and Peristalsis (Part 1)
Bolus – a rounded, semisolid mass of food that is either being swallowed or passing through the digestive tract.
Figure 50.13 The Stomach (Part 1)
Figure 50.13 The Stomach (Part 2)
Figure 51.3 Waste Products of Metabolism
ex. mammals, amphibians
Most species produce more than one nitrogenous waste. Different developmental stages may have different forms of nitrogen excretion.
ex. insects, reptiles, birds
Figure 51.8 A Tour of the Nephron
Figure 51.9 The Human Excretory System (Part 1)
Figure 51.9 The Human Excretory System (Part 2)
Figure 51.10 Concentrating the Urine