Reveal the features of the internal structure of a mammal using the example of a dog or a rabbit.

Let’s consider the internal structure of mammals using the example of a dog. A dog has a digestive system that consists of the mouth, esophagus, stomach, and intestines. The lungs, bronchi and trachea make up the respiratory system. The heart in dogs, like in all mammals, consists of four chambers. Also, dogs have a well-developed nervous system. Dogs, like all mammals, have a hormonal system. It consists of various glands of internal, external and mixed secretions. The latter, for example, includes the pancreas.