Why can birds fly into the sky? Why can birds fly in the sky

1. The body of birds is streamlined, the body surface is covered with feathers, the forelimbs become wings, the bones are light, thin and strong, the chest muscles are developed, and there are air sacs to assist lung breathing.

2. The bones are light in weight and hard in texture, with a towering keel protrusion on the chest, and there is a gas-filled cavity in the middle of the bone.

3. The chest is muscular, and the back muscles are degenerate, which is conducive to pulling the wings.

4. The nervous system and sensory organs are very developed. The heart has four chambers, the number of beats is fast, and the circulatory system is perfect.

5. There are well-developed air sacs, which can not only reduce weight but also form a unique double breathing with the lungs to meet the needs of oxygen and energy consumption when birds fly.

6. Birds have a perfect dual circulation system, and oxygen-rich blood is completely separated from hypoxic blood to ensure the demand for oxygen for flight.

7. Large amount of food and fast digestion. The rectum is short and thick, and feces cannot be stored, so frequent bowel movements, the bladder of birds disappears, and urine is excreted with feces, which is conducive to reducing the burden during flight.

8. 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 inside, and high and constant body temperature.

1. From the perspective of the bird's body structure, its body is streamlined, which can reduce the resistance of the air to it when flying in the air;

2. The bird is covered with feathers, and the feathers on the wings and tail are vibrating feathers, and the opening area is increased, and the air flow can be used to maintain the height and speed of the flight;

3. The bones of birds are a solid whole, and the bones are very thin and hollow, which reduces the weight of the bones, and at the same time, birds do not have a bladder to store urine, and the rectum is very short, and they are immediately discharged from the body after producing feces, in order to lose weight, there is a search to fly;

4. The pectoral muscles are developed, which is conducive to the bird flapping its wings and flying;

5. The bird's lungs have a special structure, namely the air sac, its breathing mode is double breathing, inhaling once, and the gas can be exchanged twice in the lungs, which increases the oxygen level, because the bird's flight needs to consume energy, so it increases the oxygen level, which is conducive to the bird's flight.

In class, the teacher asks, "What do birds fly by?" ”

Wing! The students said in unison. "Can a bird fly with just wings? The teacher asked.

The students thought, "Doesn't a bird fly only on its wings, does it need something else to fly?" The teacher said

If there is no air in the air, can a bird fly with wings? It is precisely because there is air in the air that the flapping wings of the bird can create air currents in the air, thus carrying the bird to fly. If there is no air around the bird, no matter how big the bird's wings are, no matter how hard the bird's wings are flapped, it will not be able to make it fly.

The teacher talked about life from the flight of birds. "Students, if one day, when your dreams 'fly', you must remember that what makes you 'fly' is not only your own 'wings', but also the people around you and the surrounding environment. The teacher said

How can we not forget God's grace when we have gifts, when we have a little achievement, when we sit in a high position, when we are waiting for fruitful service, when our families are harmonious and happy?Will you forget the help of people?Will you get carried away?

My cousin and I grew up in the same village, and when I grew up, in the eyes of the elders, I said that I was more promising, had a house and a car, and was filial to my parents, and he was still in debt, which made my parents worry. What's more important is that the environment is different. Although they are all from the same village, the parents of the family are different, and the children's behavior and habits are different!

My parents are thrifty and gracious to others, and my mother is never pessimistic and complaining. Later, after getting married, my husband's family was a loving and accepting family atmosphere, and my sister-in-law and sister set a good example in many ways, and the same sex around her was also very good, and she was later chosen by God to become a child of the Father!Always remind me to follow the right path!

I was thinking, if I were put in my cousin's environment, I would definitely be inferior to him in many ways!

1Corinthians 4:7 Who is it that makes you different from others?What do you not receive?If they have received it, why should they boast as if they had not received it?

So a lot of the environment is given to us by God, if one day we fly up like little birds and fly high!Always be thankful, not for how good we are, but for God's grace!Help us with many people and things, shape us through the environment!

Because we don't have a single thing that we don't receive!

How birds fly to the sky.

1. Wave your wings.

The image below is a model of a bird flying, with small black strips on its wings representing feathers. When the wings are waved upwards, the feathers open like shutters, and the air flow can pass through the wings with very little resistance; When the wings are waved downward, the blinds are closed. At this time, the wings become an impermeable wall, and when they wave downward, the air will give the wings a very large upward force, that is, lift.

When the lift is greater than gravity, the bird can take off off from the ground.

To add up, the wings of insects are not the same as those of birds, so the way of generating lift is slightly different.

2.Lift Generated by Advancing In addition, during the process of flying forward, an upward lift is generated even if the bird does not wave its wings. Today's fixed-wing aircraft are also designed based on its principles.

The bird's wings, when viewed from the side, compare the green shape below, which is thick in the front and thin in the back, and has a slight downward curve. What happens when a bird flies forward?

When the air flows through the wings in two parts, the upper and lower parts at point A, it will reach point B at the same time (if you are interested, you can check the knowledge of fluid mechanics, which will not be explained in detail here). Since the time is the same, the air above the wings travels farther distance, and in order to reach point B on time, it is only possible to achieve this goal by running faster than the air below.

Then it was the turn of another big bull: Daniel Bernoull. The famous Bernoulli equation tells us:

For a stable flow of an incompressible ideal fluid, the sum of kinetic energy, potential energy and pressure per unit volume of fluid at any point in the same flow tube is a constant quantity. Since the potential energy of the air flowing above and below the wings is not much different and is negligible. Due to the high velocity of the flow above, the pressure above naturally decreases, so the wings generate upward lift.

3.The use of lift generated by updrafts is not strictly considered to be generated by the birds themselves, but can only be regarded as birds making good use of external forces. As the air near the surface becomes warmer, the volume expands, and the density decreases, and this part of the hot air rises (red arrows in the diagram below), which is the nature of updrafts.

When the updraft is strong enough, pigs can be blown into the sky, no, it should be birds that can be blown into the sky. Hawks are one of the birds that make good use of updrafts.

The ascent problem has been solved, and the bird can fly into the sky. It's just that the bird can't always sing "I want to fly higher" and keep flying, it must also be able to fly forward. So where does the motivation to move forward** come?

The answer is: wings. As can be seen from the slow motion below, the bird's wings are not purely waving up and down, but are optional at a certain angle.