What is the protrusion on the ventral surface of an earthworm called? What is the protrusion on the

It's the Waiguchi Festival. Earthworms are annelids. The first body segment of annelids, the mouth is located on its ventral surface, the perioral segment does not have bristles or verrucous feet, and in polychaetes, there are often perioral tentacles, which are sensory organs.

Bristles, which are used to assist crawling.

There are bristles, and the protrusions are the reproductive rings of the earthworms, indicating that the earthworms have become sexually mature, and the earthworms are mating and breeding the next generation through the reproductive rings.

(1) Touch the abdomen of the earthworm's body with your hands, feel rough, and observe with a magnifying glass, you can see that there are many small protrusions in the abdomen, and these protrusions are called

2) During the experiment, the body surface of the earthworm should be gently rubbed with a wet cotton ball soaked in water, because the earthworm breathes by the moist body wall

3) Comparison: Earthworms move faster on rough paper than on smooth glass plates

4) According to the experimental analysis, the movement of the earthworm is completed by the interaction of the longitudinal and annular 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 annular muscles are contracted, 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, at this time, the longitudinal muscles are contracted, the annular muscles are relaxed, and the body is shortened forward and the contraction and relaxation are alternately carried out so that the earthworm wriggles forward

So the answer is: (1) bristles; (2) moist body walls; (3) fast; (4) peristalsis; Muscles; Bristles

(1) The body of the earthworm is cylindrical, consisting of more than 100 similar annular segments There is a wide and smooth segment near the front end of the body, called the annular belt The anterior end is about 13 segments close to the annular band, and the posterior end is far from the annular band

2) There are bristles in the middle of most body segments on the ventral surface of earthworms, and the bristles have the effect of assisting movement Therefore, when gently touching the earthworm's body surface back and forth with your hands, there will be a rough and uneven feeling, this is because you touch the bristles on the earthworm's body surface Observing with a magnifying glass, you can see that there are many small protrusions in the abdomen, and these protrusions are bristles

3)) The movement of the earthworm is completed by relying on the interaction of the longitudinal and annular 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 annular muscles are contracted, 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, at this time, the longitudinal muscles are contracted, the annular muscles are relaxed, and the body is shortened forward and moved forward The earthworm is moved through the expansion and contraction of the body muscles and the coordination of the bristles, and the bristles cannot be fixed and supported on the smooth glass. Therefore, the movement of earthworms on the glass plate is slower than that on paper The body wall of the earthworm can secrete mucus and remain moist all the time, so the place where the earthworm has moved, there are traces of moisture

4) Earthworms breathe with a moist body wall, oxygen is first dissolved in the mucus of the body wall, and then penetrates into the blood in the capillaries in the body wall, and the carbon dioxide in the blood is also excreted through the body wall

The wet soil used in the bottle can keep the earthworm body wall moist, which is conducive to breathing, and the earthworm can survive normally; B uses dry soil, which is easy to dry the surface of the earthworm, oxygen cannot be dissolved and cannot penetrate into the body wall, and the earthworm cannot breathe, resulting in the earthworm's ability to wriggle significantly weakened until death

Therefore, the answer is: (1) annular somite; Ring belt

2) roughness; Bristles

3) Slow; Mucus

4) B; The earthworm breathes by the moist body wall, and the dry fine soil quickly absorbs the water on the earthworm's body surface, making the body surface dry and unable to breathe

Earthworm. The body is long cylindrical. Some resemble nematoids, but the surface of the body is not smooth and has links, which belong to annelids.

Door. 1. Earthworms are terrestrial in the class Oligochaeta.

Annelid. Lives in moist, loose and fertile soils.

2. The body of the earthworm is long and cylindrical, slightly lighter brown, and is composed of more than 100 body segments. The anterior segment is slightly pointed, the posterior end is slightly rounded, and there is a segmented inconspicuous ring at the anterior end.

3. The ventral surface of the earthworm is light in color, and most of the body segments have bristles in the middle, which play a fixed supporting role and auxiliary movement role when the earthworm crawls.

4. After the earthworm has 11 body segments, there are dorsal holes at the dorsal line of the back of each segment, which is conducive to breathing and keeping the body moist.

Earthworm invertebrates, phylum Annelids, oligochaetes. There are more than 2,500 species. There are about 100 species in our country.

The most common in various places are the giant earthworm (Megascolex mauritti) and the burrowing ringworm (phere-tima). The body is long cylindrical, about 30 cm long, and consists of more than 70 100 body segments.

Ring-shaped or linear.

Reference encyclopedia.

Earthworms belong to annelids, there is no skeleton, and the movement of earthworms is completed by relying on the interaction of longitudinal and annular muscles and the cooperation of bristles on the body surface When the earthworm advances, the bristles at the back of the body are fixed, at this time, the annular muscles contract, the longitudinal muscles relax, and the body stretches forward, and then the bristles at the front of the body are fixed, and then the longitudinal muscles contract, the annular muscles relax, and the body shortens forward and advances Contraction and relaxation alternately carry out, so that the earthworm wriggles forward Therefore, the role of many small protrusions (bristles) on the ventral surface of the earthworm somite is to assist in movement Therefore, choose B

(1) As can be seen from the figure, the body of the earthworm is cylindrical and consists of many similar rings The ring-like structure near the front end is called the ring belt

2) Touch the abdomen of the earthworm's body with your hands and feel rough When you look at it with a magnifying glass, you can see that there are many small protrusions in the abdomen, which are bristles, and this structure has the function of assisting the earthworm to move

3) The body wall of the earthworm can secrete mucus and always keep the moist body wall to complete the respiration The body wall of the earthworm is densely covered with capillaries, and the oxygen in the air is first dissolved in the mucus on the body surface, and then seeps into the capillaries of the body wall The carbon dioxide in the body is also discharged from the body surface through the capillaries of the body wall

So the answer is: (1) cylindrical; Ring belt

2) bristles; Earthworm.

3) Body wall.