-Popular culture and the media may promote unhealthy body images.
Overview of Animal Nutrition
Animals are heterotrophs, organisms that must feed on other organisms.
Feed mainly on plants.
Mainly eat animals that eat plants.
Omnivores - Ingest both plants and animals.
How do Animals Obtain Food Suspension feeders – extract food particles suspended in surrounding water Substrate feeders – live in or on food source and eat their way through it Fluid feeder – gets food by sucking nutrient-rich fluids from living host Bulk feeders – Ingest large pieces of food Tube worm
The Four Stages of Food Processing
Is another word for eating.
Is the breakdown of food to small nutrient molecules.
Is the uptake of the small nutrient molecules by cells lining the digestive tract.
Is the disposal of undigested materials from the food we eat.
Digestion: A Closer Look
Begins the process.
Involves physical processes like chewing.
Is the chemical breakdown of food by digestive enzymes.
Dismantles food particles for use by the body.
In animals, chemical digestion is contained safely within some kind of compartment.
Food vacuoles – simplest digestive compartment
Are intracellular organelles filled with digestive enzymes.
Gastrovascular cavities are
compartments with a single opening.
Digestive tubes have two separate openings, a mouth and an anus.
Specialized organs are along the length to perform 4 main functions of food processing