What are the good places for birds to fly?

Birds are a group of higher vertebrates that evolved from ancient reptiles and adapted to flight. In addition to many of their morphological structures, they also have many differences from reptiles. On the one hand, these differences are that they have developed greatly on the basis of reptiles, and have a series of progressive characteristics that are higher than reptiles.

For example, a high and constant body temperature, a well-developed dual circulation system, a well-developed nervous system and sensory organs, and various complex behaviors associated with this; On the other hand, in order to adapt to the flying life, there are more specializations, such as the body is streamlined, the body surface is feathered, the forelimbs are specialized into wings, the bones are strong, light and multi-combined, with air sacs and lungs, air sacs are the structure of the first bird to have enough oxygen when flying. The contraction and expansion of the airbag are coordinated with the movement of the wings. The wings are raised, the air sacs expand, and a portion of the outside air enters the lungs for gas exchange.

In addition, most of the air passes through the lungs directly into the air sacs, and the air bags temporarily store a large amount of oxygenated air without gas exchange. The wings droop, the air sac contracted, and the air in the air bag passed through the lungs for another gas exchange and finally expelled from the body. In this way, every time the bird breathes, the air exchanges gas twice in the lungs, and it can be seen that the air sac does not have the role of gas exchange, its function is to store air and assist the lungs to complete the respiration function.

The airbag also has the effect of reducing the specific gravity of the body, dissipating heat, and regulating body temperature. This series of specialization gives birds a strong ability to fly and can carry out special flight movements. Because birds have a series of high-level characteristics in terms of morphological structure, and have strong flight ability, they can carry out rapid flight movements, making them a wide variety of species, all over the world, and becoming the second outline of vertebrates after fish.

What did you do in junior high school biology class?

The body is streamlined.

The surface of the body is feathered, and the forelimbs are specialized into wings.

The bones are strong and light, with many temperamental bones and a towering keel protrusion on the chest.

The pectoral muscles are well developed. Eat a lot and digest quickly.

The heart has four chambers, the number of beats is fast, and the circulatory system is perfect.

There are well-developed air sacs, which can both reduce weight and form a unique double exhaler roller with the lungs. In short, birds are a class of animals with feathers on the body surface, forelimbs specialized into wings, the ability to fly quickly, air sacs in the inner body, and a high and constant body temperature.

The body is streamlined.

The body surface is feathered, and the forelimbs are specialized into wings.

The bones are strong and light, with many temperamental bones and a towering keel protrusion on the chest.

The pectoral muscles are well developed. Eat a lot and digest quickly.

The heart has four chambers, the number of beats is fast, and the circulatory system is perfect.

There are well-developed air sacs, which can not only reduce weight but also form a unique double breath with the lungs. In short, birds are a type of animal with feathers on the body surface, wings on the forelimbs, the ability to fly quickly, air sacs inside, and a high and constant body temperature.

The structural features of birds are always adapted to their lives, such as the forelimbs become wings, with large regular feathers, arranged in a fan shape, suitable for flight; The body is streamlined, which can reduce drag when flying; There are air sacs in the body to assist the lungs to complete double breathing and can supply sufficient oxygen; Some bones are hollow, some bones are healed, and the rectum is very short, which can reduce weight; The pectoral muscles are well developed, which is conducive to pulling the wings to complete the flight maneuver Large appetite and strong digestion ability, which can provide sufficient nutrients for the flight

Therefore, the answer is: in appearance: the body is streamlined, the body surface is feathered, and the forelimbs are winged.

Sports: the pectoral muscles are well developed, there are keel protrusions, and the long bones are mostly hollow, light, thin but strong.

Digestion: large amount of food, strong digestion ability, can provide sufficient energy; The rectum is short, and the stool can be passed in a timely manner.

Respiratory: There are well-developed air sacs, double breathing, and strong oxygen supply capacity.

Circulatory: The heart has four chambers, two circulatory routes, and the heart beats fast.

Categories: Science & Engineering.

Analysis: The wings of birds are the first condition for them to have flying skills. Under the same conditions of having wings, some birds can fly very high, very quickly, very far; Some birds can only hover, glide, or even fly at all.

It can be seen that just wings have a lot of knowledge.

The structure of a bird's wings is no less complex than the bird itself. If the feathers of the bird's wings are constructed, the principle of aerodynamics can be skillfully applied, and when they are fanning up and down or pressing up and down, they can push the air and fly forward using the principle of reaction; The structure of the feathers is reasonable, which can effectively reduce the air resistance encountered during flight, and some can also play a role in de-trembling and noise reduction. There are great differences in the wings of various species of birds, so that the difference in wings alone creates many excellent and average "pilots".

Some of the country's second-class protected animals have males weighing more than 14 kilograms, with a body length of 120 centimeters and a wingspan length of 240 centimeters.

For another example, the ** bird with a wingspan of meters, which usually flies at sea 160 kilometers off the coast, is a first-class protected animal in China.

After reading the previous content, some people may ask, can you fly just by wings? No, it's the special bones that send birds to the skies. Bird bones are excellent "lightweight materials", hollow and lightweight.

According to the analysis, the bird bone accounts for only 5 6 of the bird's body weight; Human bones account for 18 of body weight. Due to the light bones, the wings are very easy to drive, and there are many air sacs connected to the lungs in the bird's body, which is very beneficial for weight loss and buoyancy.

These favorable conditions undoubtedly give the birds the ability to fly, allowing them to perform their skills in another living space. However, I think there may be other reasons why birds can fly into the blue sky, but humans have not discovered it until now.

From the understanding of the abilities of birds, we can see that exploring the abilities of birds will help humanity to open up new territories.

The morphological and structural characteristics of birds suitable for flight, body shape: streamlined, which can reduce the resistance of the air during flight. Feathers:

The feathers of the whole body of the domestic pigeon are mainly two kinds of feathers and down feathers, the main feathers are composed of feathers and feathers, covering the surface of the body, and the largest feathers are born on the wings and tail, mainly used for flight; Wings: The forelimbs become wings, the wings are fan-shaped, and there are several rows of large feathers, and the wings are the flight organs of the domestic pigeon. muscles and bones; Digestion: