Labrador Retriever( (Definite introduction)
The harm of PM2.5 to humans has been very obvious, but you would never expect that the harm of PM2.5 to dogs The damage will be greater. The main reason is that the dog's defense system is weaker than that of humans. Just breathing will inhale more harmful substances than humans.
We and our dogs live together on a continent surrounded by gas. Gas breathing allows our life activities to be maintained and continued. Once breathing stops, life will also stop. Like humans and dogs and other mammals, God invented a sophisticated respiratory system to connect our bodies with the outside atmosphere, absorb oxygen to supply cell nutrients, and exhale waste gases such as carbon dioxide. At the same time, three lines of defense were also established to protect the undesirable elements in the atmosphere.
The convoluted structure and branched trachea in the nasal cavity prevent foreign bodies from penetrating into the lungs and form the first line of defense; the nasal cavity, pharynx, trachea, bronchi and lungs The surface is rich in mucous membranes, and the fiber cilia on the mucous membranes can capture particulate matter and clean the inhaled air, and heat and moisten the air; the mucus contains immunoglobulins, lysozyme, etc. to help the lungs protect the lungs from bacterial invasion. But when God discovered such a sophisticated respiratory organ, he certainly didn't expect that an invisible substance called PM2.5 would gradually become a deadly killer.
PM2.5 will affect the gas flow in the lungs, causing various respiratory symptoms and even lung cancer. It can even further pass through the alveoli to join the blood, and travel to other organs with the blood flow. They accumulate in blood vessels and cause blood vessel stiffness, thereby impairing cardiovascular health.
In addition to possessing the personality of high-end mammals, dogs also have special structural and psychological differences with humans.
1.Poor filtration without nose hair
Like most animals, dogs do not have nose hair, and their ability to filter and clean large dust particles is weaker than humans.
2.Agile and good at smelling
The main way for dogs to explore the world is through sense and hearing. Dogs have extremely developed sensory organs. The nasal mucosa is full of olfactory nerves, and their sensory capabilities are 1,200 times greater than that of humans. Exploring paths, tracking and socializing, and sniffing seriously all the time and everywhere. This "excessive use of the nose" also reduces the intrusion of dust and germs when obtaining useful information.
3.Short body position makes it easier to inhale car exhaust
The dog's short height determines that the breathing area is near the height of car exhaust. Dogs absorb car exhaust and road dust more effectively than humans.
4.Relaxing mouth breathing
When walking the dog, the dog is accustomed to breathing through the mouth. Instead of passing through the small and complex filtration and cleaning system of the nasal cavity, the infected air enters the airway directly from the mouth, greatly reducing the degree of damage. Therefore, dogs are more susceptible to the threat of PM2.5, so be careful in smog weather.
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