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Ingestion
- Ingestion is the process of taking in food through the mouth. In vertebrates, the teeth, saliva, and tongue play important roles in mastication (preparing the food into bolus). While the food is being mechanically broken down, the enzymes in saliva begin to chemically process the food as well.
oercommons.org/courseware/lesson/15112/overviewBiology, Animal Structure and Function, Animal Nutrition and ...
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Oct 31, 2023 · The animal diet needs carbohydrates, protein, and fat, as well as vitamins and inorganic components for nutritional balance. Digestive enzymes are enzymes that break down polymeric macromolecules into their smaller building blocks, in order to facilitate their absorption by the body.
- Digestion and Absorption
When digestion is finished, it results in many simple...
- 34.3: Digestive System Processes
Obtaining nutrition and energy from food is a multi-step...
- Digestion and Absorption
Digested food molecules are absorbed into the bloodstream: Large intestine: Excess water is absorbed back into the body. Undigested food is stored in the rectum, the lower part of the large...
Jul 31, 2016 · Digestion and absorption begin in the mouth, with the mastication (chewing) of food and its mixture with saliva. Digestion continues throughout the gastrointestinal system and ends with the excretion of waste products and undigested food particles in the feces.
When digestion is finished, it results in many simple nutrient molecules that must go through the process of absorption from the GI tract by blood or lymph so they can be used by cells throughout the body. A few substances are absorbed in the stomach and large intestine.
- 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...
Obtaining nutrition and energy from food is a multi-step process. For true animals, the first step is ingestion, the act of taking in food. This is followed by digestion, absorption, and elimination. In the following sections, each of these steps will be discussed in detail.
Absorption is the process by which the products of digestion are absorbed by the blood to be supplied to the rest of the body. During absorption, the digested products are transported into the blood or lymph through the mucous membrane.
