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Birds have a highly efficient, simplified digestive system. Recent fossil evidence has shown that the evolutionary divergence of birds from other land animals was characterized by streamlining and simplifying the digestive system. Unlike many other animals, birds do not have teeth to chew their food. In place of lips, they have sharp pointy beaks.
- 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...
- Lithoredo abatanica. Discovery of a new species/genus – Lithoredo Abatanica. The Litoredo abantanica is a newly-discovered form of shipworm—so new, in fact, that scientists are still figuring out the mysteries of its eating habits.
- Hagfish. The Hagfish Is the Slimy Sea Creature of Your Nightmares. When your primary source of nutrition is burying yourself in dead animals, absorbing nutrients through your skin can be pretty useful.
- Starfish. sea-stars eating mussels. If you’re a starfish, every mealtime starts with extending your stomach out of your mouth. Once it’s out, the stomach engulfs any edible parts of the prey, inserting itself inside shells if necessary.
- Termites. Termites Digest Wood Thanks To Microbes | I Contain Multitudes. Finding termites in your garden is rarely a welcome discovery, but recent research on termite digestion could cast these roach-like critters in a new light.
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 15.6 ab. The process of digestion begins with the mouth and the intake of food.
- Charles Molnar, Jane Gair
- 2015
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.
Function of the Digestive System in Animals. The primary functions of the GI tract include prehension of food and water; mastication, salivation, and swallowing of food; digestion of food and absorption of nutrients; maintenance of fluid and electrolyte balance; and evacuation of waste products. These functions can be broadly characterized as ...
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Jun 16, 2020 · Humans and many animals have a monogastric digestive system as illustrated in Figure 2.2.5 2.2. 5. The process of digestion begins with the mouth and the intake of food. The teeth play an important role in masticating (chewing) or physically breaking down food into smaller particles.
