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Birds have developed a digestive system adapted to eating unmasticated (not chewed up) food. Monogastric: Single-chambered Stomach. As the word monogastric suggests, this type of digestive system consists of one (“mono”) stomach chamber (“gastric”). Humans and many animals have a monogastric digestive system as illustrated in Figure 2a ...
- Invertebrates with Primitive Digestion Systems
- Complete Digestive Systems
- Digestive Systems of Vertebrate Animals
- Mammals
- Ruminants
- Birds
Let’s first consider flatworms. One of the best known types of flatworms are tapeworms. As their name suggests, they look like long pieces of tape! All tapeworms are parasitesthat live in the digestive systems of other animals. Instead of finding their own nutrients, they absorb the pre-digested nutrients from their hosts directly through their bod...
Roundworms and annelids, like earthworms, are more advanced. They have a complete digestive system. Other invertebrates, such as insects, spiders and crabs also have a complete digestive system. A complete digestive system has a gastrointestinal tract(GI tract). This tract is a one-way system that starts at the mouth and ends at the anus. A GI trac...
Vertebrates are a group of animals that includes fish, amphibians, reptiles, mammals and birds. All vertebrates have a complete digestive system with a similar design. The system starts at the mouth. The mouth connects via a tube, called the esophagus, to the stomach. The stomach is usually an acidic environment where food is broken down into small...
Let’s start by looking at our own digestive system. Knowing how ours works will help you to understand the differences with other groups of mammals. Parts of the human digestive system include: Several other important organs participate in digestion but are not within the GI tract. One of these is your liver. Your liver produces bile. Bile is a che...
Ruminants are a groupof hooved herbivorous animals. This group includes cows, sheep, goats, deer, llamas, camels and giraffes. Ruminants have a very large stomach. It takes up ¾ of their abdominal cavity. Unlike ours, it has four compartments. Food travels through them in this order: 1. Rumen The rumen is the largest of the four chambers.This is wh...
Because stomachs are heavy muscular organs, birds have small ones to make flying easier. The term for the stomach of birds is proventriculus. Before entering the proventriculus, food is first stored in the crop. Unlike mammals, birds do not have teeth and cannot chew their food. The physical breakdown of their food mostly happens in an organ called...
Boundless. 34.1: Digestive Systems - Introduction. Animals use the organs of their digestive systems to extract important nutrients from food they consume, which can later be absorbed. 34.2: Digestive Systems - Herbivores, Omnivores, and Carnivores. Animals can be carnivores, herbivores, or omnivores in their eating strategies.
During digestion, food particles are broken down to smaller components, and later, they are absorbed by the body. 34.0: Prelude to Animal Nutrition and the Digestive System. One of the challenges in human nutrition is maintaining a balance between food intake, storage, and energy expenditure. Imbalances can have serious health consequences.
A large part of digestion occurs in the stomach, shown in Figure 15.11. The stomach is a saclike organ that secretes gastric digestive juices. The pH in the stomach is between 1.5 and 2.5. This highly acidic environment is required for the chemical breakdown of food and the extraction of nutrients.
- Charles Molnar, Jane Gair
- 2015
Chapter 15. Animal Nutrition and the Digestive System. Figure 15.1. For humans, fruits and vegetables are important in maintaining a balanced diet. (credit: modification of work by Julie Rybarczyk) Introduction. All living organisms need nutrients to survive. While plants can obtain the molecules required for cellular function through the ...
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Overall, food-producing animals such as pigs and chickens and companion animals (cats, dogs) have a pouch-like, noncompartmentalized stomach, whereas ruminant animals (cows, sheep) have more specialized fermenting chambers. Classification of animals by digestive tract fermentation site is shown in Table 2.1.
