Do you know | Keep a dog alive? Dogs can really smell cancer in humans?

 Do you know | Keep a dog alive? Dogs can really smell cancer in humans?

Production | Netease Science and Technology Know or not column group (public number: tech_163)

Dogs can smell cancers in bleeding, according to a new study presented by the American Society of Biochemistry and Molecular Biology in Orlando, Florida, USA. Dogssense of smell can recognize cancers in blood samples with an accuracy of about 97%. Dogs may become an important small helper in cancer screening in the future.

This report was quickly searched on top.

Some people cant help but ask, can dogs really smell that humans are suffering from cancer? Before answering this question, we need to understand the dogs sense of smell.

The olfactory sensitivity of dogs is about 1200 times that of humans.

Someone always jokes that your nose is really more sensitive than a dogs Turin to describe a persons taste.

In fact, this sentence is not derogatory. It must be affirmed that the dogs sense of smell is sensitive. The dogs sense of smell occupies the most important position in its sensory ability. It is known that the total number of olfactory cells in dogs is 40 to 100 times that of human beings. The overall sense of smell is about 1200 times that of human beings. Therefore, some special odors are particularly sensitive to dogs. It is said that, 1. Only trained dogs can distinguish more than 100,000 odors.

At the same time, there are many folds in the nasal cavity of dogs, which are similar to human beings, but their folds are much more than human beings, spreading out about four times the area of human beings, and the olfactory cells on the folds are also dense and dense.

Relevant research results show that there are only 5 million olfactory cells covering a small part of the upper nasal mucosa, covering only about 5 square centimeters; while dogs have many wrinkles in their noses, so the surface area of their noses has increased a lot. Dogs have about 12.5-20 million olfactory cells, and some breeds have more.

For example, a shepherd dog has 220 million olfactory cells. These olfactory cells cover about 150 square centimeters in the nasal cavity. With so many olfactory cells, dogs have at least one million times the olfactory capacity of our humans.

And the dogs nose must be kept moist, otherwise the sense of smell will deteriorate, so the dog needs to lick its nose frequently, so the owners of dogs can also judge their health status from the moist degree of the dogs nose.

Dogs can really smell cancer in humans?

So, back to what were going to talk about, is a dogs nose so sensitive that it really smells cancer? In fact, the answer is yes, because dogs use wet noses to contaminate odor molecules in the air and transmit them to the brain via olfactory nerves, which is impossible for ordinary animals to do. Scientists explain that cancerous cells produce volatile molecules, which emit special odors when they enter urine. These odors are dispersed into the air and captured by dogsnoses. So we can smell the special odor and feed it back to human beings.

In fact, it has long been confirmed that dogs can smell cancer. It is presumed that the volatile chemical odor components of tumors have been studied since 1989. Later studies have proved that dogs can smell cancer in breast, skin and intestine. Researchers are also convinced that tumors produce volatile chemicals that dogs can smell.

In addition, its not just cancer. According to American researchers, the dogs sense of smell has also been used in the diagnosis of thyroid cancer patients. Researchers tested 34 cancer patients and diagnosed them with dog olfaction. The results showed that the correct rate was 88%.

Of course, there are also studies that pigeons, giant rats and other animals after training, can also identify the corresponding diseases.

Extension: Dogs also socialize through olfaction

In addition to smelling cancer with the nose, dogs also use the nose to socialize. They know each other through the nose, and they know new friends through the nose. The first act of meeting two dogs is to sniff at peoples buttocks. In fact, this is to smell each others sex, age and hobbies. They can understand each others life habits without barking at all.

It is unexpected that our lovely dog can not only accompany human beings through unforgettable moments, but also act as our little doctor, not only to cure our sometimes depressed mood, but also to help find potential diseases.

Therefore, please treat our human good friend dog!

(Note: Some of the content of the article is quoted from the compiled content of the network and foreign media)

Netease Science and Technology Know or not column, curious about the world, with you to explore the unknown.

Pay attention to Netease Technological Micro-Signal (ID: tech_163), send Know or Not, you can see all the knowledgeable manuscripts.

Source: Editor in charge of knowledge: Qiao Junjing_NBJ11279