Earthworms, how do snakes walk ?

The snake walks on its belly.

The muscles in the abdomen push backwards.

Earthworms walk by telescoping.

The tail retracts and sticks out at the head.

Elaboration: The muscles of earthworms belong to the striated muscles, which generally account for about 40 of the body volume, and the muscles are developed and flexible. In earthworms, the longitudinal muscle layer of some somites shrinks and the annular muscle layer relaxes, so the somites become thicker and shorter, and the bristles that are born on the body wall and stretch out obliquely and protrude into the surrounding soil. At this time, the annular muscle layer of the previous somite contractes, the longitudinal muscle layer relaxes, the body segment becomes thinner and longer, the bristles retract, and the surrounding soil is freed from contact, so that the body is pushed forward by the support of the bristles of the latter segment.

In this way, the contraction waves of the muscles are gradually transmitted from front to back along the longitudinal axis of the body. Causes earthworm movement.

The reason why snakes can crawl is because they have a special way of locomotion: one is a meandering movement, and all snakes can crawl forward in this way. When crawling, the snake body makes a horizontal wavy bend on the ground, so that the back of the bend exerts force on the rough ground, and the reaction force of the ground pushes the snake body forward, if the snake is placed on a smooth glass plate, then it will be difficult to move an inch, and it will not be able to crawl in this way, of course, there is no need to worry about the snake, because in nature there will be no smooth ground like glass.

The second is the crawler movement, the snake does not have a sternum, its ribs can move freely back and forth, and there are costal skin muscles between the ribs and the abdominal scales. When the costal muscles contract, the ribs move forward, which drives the wide abdominal scales to erect in turn, that is, slightly warped, the upturned abdominal scales are like stepping on the ground, but at this time only the abdominal scales move and the snake body does not move, and then the costal skin muscles relax, the posterior edge of the abdominal scales exert force on the rough ground, and push the snake body forward by reaction, and the effect of this movement is to make the snake body crawl forward in a straight line, just like a tank. The third way is the telescopic movement, the front of the snake body is raised, stretch forward as much as possible, when it touches the supported object, the back of the snake will follow the retraction forward, and then lift the front of the body to stretch forward to get the support, and the back part will retract forward, so that the snake can continue to crawl forward.

Snakes that crawl slowly on the ground, such as lead-colored water snakes, will quickly expand and contract continuously when alarmed, speeding up the crawling speed and giving people the feeling of jumping.

The snake walks on its belly, and the muscles in the abdomen push backwards.

The snake's abdomen has many wide scales, and its ribs move freely back and forth. When the muscles on the ribs contract, the ribs move forward, driving the scales forward, but at this time, only the scales move and the snake body does not move; Immediately afterward, the muscles on the ribs relaxed, and the tips of the scales stepped on the rough ground or other objects such as tree trunks like feet, and the snake body was pushed forward by the reaction force. When one side is contracted, the other side is stretched, which causes the body to bend, and a loose wave passes from beginning to end on both sides of the body in opposite positions.

If the wave is not hindered during its transmission, this muscular activity forms a bend that passes through the body.

The snake's whole body is covered with scales, and the vertebrae that face it can bend up, down, left and right. It has no sternum and the ribs can move freely back and forth. When the muscles on the ribs contract, the ribs move forward, causing the scales to move forward (at which point the snake does not move).

Immediately after that, the muscles on the ribs relax, and the tips of the scales act like feet, stepping on rough ground or other objects, and pushing the body forward by the reaction force.

Earthworms walk by telescoping, with the tail retracted and protruding on the head.

The movement of earthworms is completed by the interaction and contraction of the longitudinal and transverse muscles and the cooperation of the bristles on the body surface. When the earthworm advances, the bristles at the back of the body are not moving, then the transverse muscles contract, the longitudinal muscles are relaxed, and the body is stretched forward, and then the bristles at the front of the body are nailed into the soil and do not move, then the longitudinal muscles contract, the transverse muscles are relaxed, and the body is shortened forward and forward.

The earthworm wriggles forward, and the snake bends and swings and glides forward.

The 'bristles' on the earthworm's body are the hairs.

The snake relies on the contraction of the muscles in its abdomen to drive the scales to stand and move down.

The snake walks on its belly.

Earthworms walk by telescoping.

It relies on muscle contraction to push forward and backward to advance.

Advantages and disadvantages of earthworms and pythons Hello, pro The story of "Earthworms and Pythons" is about self-immeasuring, not according to the actual situation, blindly imitating the strong, and it is not good for yourself. "The Earthworm and the Python" shows that it is very inappropriate to go to extremes, and that a wise man would not do so. Foolish people are the easiest to believe what they hear, and while they are easy to win, they are also the easiest to lose.

Everyone has a different opinion of this kind of person. This kind of stupid person is an unreliable close friend, a child who will never grow up, because they can't judge the change of the situation, and they can't grasp their own emotions. Their will and judgment are like limping feet, leaning one moment to this side, the other to that side.

Earthworms and snakes are not one of the same animals. These two belong to different species of animals. Earthworms are invertebrates, while snakes are vertebrates. Snakes are a special group of organisms that have undergone a long evolution of 100 million years, and earthworms are one of the annelids, also known as earth dragons.

There are more than 3,000 kinds of earthworms in the world, and there are more than 200 kinds in China.

There are 3425 species of snakes in the world, and there are 241 species in China.

Snakes and earthworms are both elongated and elongated, but the difference in size is very large. Earthworms are sometimes used as bait, but snakes are more dangerous than earthworms, so you should take precautions when encountering snakes.