The physiological characteristics of birds suitable for flight, and is the flight of birds a physiol

1 Body is streamlined.

2. Well-developed pectoral muscles.

3. The rectum is short, the amount of food is large and the digestion is fast, that is, the digestive system is developed, which helps to reduce weight and is conducive to flying.

4The heart has two atria and two ventricles, and the number of heartbeats is fast. Constant body temperature.

5. In addition to the lungs, the respiratory organs also have air sacs formed by the protrusion of the lung wall, which are used to help the lungs breathe twice.

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.

On the outside of the bird's body are light, warm feathers. Feathers not only have a thermal insulation effect, but also give birds a streamlined appearance, with the least resistance when moving in the air, which is conducive to flight. The two wings are constantly flapping up and down, agitating the air current, and a huge downward pressure resistance will occur, causing the bird to fly forward quickly.

1) The body is streamlined, which is conducive to the collapse of the god and reduces the resistance of the air during flight

2) The forelimbs become wings, with feathers, and the fan-shaped shape increases the surface area in contact with the air, which is conducive to fanning the air; The pectoral muscles are well developed and can pull the wings to complete the flight maneuver

3) The bones of birds are strong, light and thin, some bones are hollow, and some bones are healed, which can reduce body weight and facilitate flight

4) The rectum is short and does not store feces, the keel protrusion, the hollow and round long bones, and the thin bones, which is conducive to weight loss

5) The respiratory organ of the bird is the lungs, birds need to consume a lot of energy when flying, birds have air sacs, communicate with the lungs, the main function is to store air, so that birds breathe once, in the lungs for two gas exchanges, this phenomenon is called double breathing Double breathing is a breathing mode for birds to adapt to flight life, improve the efficiency of gas exchange, provide sufficient oxygen for flight, in order to decompose more organic matter, release more energy, to meet the needs of flight

So the answer is: 1) Air

2) wings; Pectoral muscles

3) light; Thin; Hollow;

4) rectum; 5) airbags; Double; Oxygen ,10, The morphological structure and physiological characteristics of birds suitable for flight life are completed.

1) The bird's body is streamlined, which can reduce the drag when flying and is conducive to flight

2) The bird's body surface is covered with feathers, and the forelimbs become several rows of large positive feathers, and the thorax has a very prominent keel process, which is well developed and can pull the wings to complete the flight

3) The bones of birds are strong and long, which can reduce weight and facilitate flight

4) The bird's digestion is strong, very short, and the feces are discharged at any time, which can reduce weight and facilitate flight

5) The respiration of birds is vigorous, and in addition to the lungs, there are many other organs that communicate with the lungs with special respiration; This particular way of breathing satisfies a large number of needs of the bird when flying

1.The body shape is streamlined to reduce air resistance when flying.

2.The body is covered with feathers, and the forelimbs become wings.

3.The pectoral muscles are well developed.

4.The bones are thin and strong, and the long bones are hollow with keel protrusions.

5.The digestive system is well developed, the amount of food is large, the digestion ability is strong, and the bowel movement is rapid6There are special air bags to assist breathing.

7.The circulatory system is well-structured, the heart rate is fast, and the function of transporting nutrients and oxygen is strong.