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Mar 26, 2016 · Once an organism — a plant or animal — ingests (or absorbs) food, the organism’s digestive system immediately starts breaking down the food to release the nutrients. The smallest digestive system can be found in organisms made up of several cells. However, the system, in which specialized cells surround a digestive cavity, gets the job done.
Learn about how different animals digest their foods and the organs of their digestive systems. All animals need nutrients from their environment. Nutrients provide energy and materials to build new cells and tissues. Nutrients include proteins, carbohydrates and sugars, vitamins, minerals and fats. Different types of animals have different ...
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
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.
The digestive system has three main functions relating to food: digestion of food, absorption of nutrients from food, and elimination of solid food waste. Digestion is the process of breaking down food into components the body can absorb. It consists of two types of processes: mechanical digestion and chemical digestion.
The oral cavity, or mouth, is the point of entry of food into the digestive system, illustrated in Figure 8. The food consumed is broken into smaller particles by mastication, the chewing action of the teeth. All mammals have teeth and can chew their food. Figure 8. Digestion of food begins in the (a) oral cavity.
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Oct 31, 2023 · The amino acids are absorbed into the bloodstream through the small intestine. Figure 34.10.1 34.10. 1: Protein digestion and absorption: Protein digestion is a multistep process that begins in the stomach and continues through the intestines. Proteins are absorbed into the blood stream by the small intestine.
