Answer:
In summary, the last three units of organization in a dog, from largest to smallest, are:
1. Organ System: The digestive system
2. Organ: The stomach
3. Tissue: The gastric mucosa
These units of organization work together to maintain the dog's overall health and function.
Explanation:
In a dog, the last three units of organization from largest to smallest are:
1. Organ System:
Example: The digestive system
The digestive system is an organ system in dogs that is responsible for the intake, digestion, and absorption of food. It includes organs such as the mouth, esophagus, stomach, small intestine, large intestine, liver, pancreas, and gallbladder.
2. Organ:
Example: The stomach
The stomach is an organ within the digestive system of a dog. It is a J-shaped, muscular sac that receives food from the esophagus and plays a crucial role in the initial stages of digestion by breaking down food through mechanical and chemical processes.
3. Tissue:
Example: Gastric mucosa
The gastric mucosa is a type of tissue found in the lining of the dog's stomach. It is composed of specialized epithelial cells that secrete gastric juices, including hydrochloric acid and digestive enzymes, which aid in the breakdown of food.