Difference between human circulatory system and insects

There is a significant difference between the circulatory system of humans and the circulatory system of insects, which is mainly reflected in the openness of circulation, the composition of blood and the composition of the circulatory system.

1.Openness of circulation: The circulatory system in humans is a closed duct system, which means that blood flows in one direction in the blood vessels and does not flow back into the body cavity.

Whereas, the circulatory system of insects is open-tube, which means that blood can flow freely between various parts of the body without a clear one-way circulation path.

2.Composition of blood: Human blood is mainly made up of plasma, red blood cells, white blood cells, and platelets, while the blood of insects is known as hemolymph, which does not contain red blood cells and white blood cells but contains plasma, blood cells, and platelets.

3.Composition of the circulatory system: The human circulatory system includes the heart, blood vessels and blood, where the heart plays the role of pumping blood, and the blood vessels are responsible for transporting blood, and the blood carries oxygen and nutrients.

In contrast, the circulatory system of insects is mainly made up of blood cavities, blood sinuses, and the heart, which are the spaces between cells and organs in the insect's body, where blood flows, and the heart, which is responsible for beating, making blood flow through the body.

In summary, there are obvious differences between the human circulatory system and the circulatory system of insects in terms of the openness of circulation, the composition of blood, and the composition of the circulatory system.

The human circulatory system is a closed-tube cycle, and the insect circulatory system is a switch-on cycle.

A portion of the blood from the open circulatory system flows into the body cavities; The closed circulatory system, on the other hand, has a special blood transport channel that does not flow back into the body cavity.

revolves around life and death.

In fact, it is recommended that you write about the emergence of a species to wear out.

Before the advent of humans, insects had a long-standing relationship with the flora and fauna in their surroundings. After the emergence of human beings, in the process of transforming and using nature, they have also formed a complex and close relationship with insects. According to the economic and health views of human beings, insects can be divided into two categories: "beneficial insects" and "pests".

Insects that directly or indirectly endanger human health or cause harm to human economic interests are collectively referred to as pests; Otherwise, it is called a beneficial insect. However, the benefits and harms of insects to humans are only relative, not static.

insect scale diagram; According to statistics, there are about 10,000 kinds of common agricultural pests and about 400 species of forest pests. Although there are not many dominant species of agricultural and forestry pests, the economic losses caused are very huge. fao：

Five crops (rice, wheat, cotton, maize, sugarcane) are lost more than $200 billion annually to pests worldwide. United States: The annual loss due to diseases, insects, grasses and rodents accounts for about 1 3 of the total agricultural output value; In 1974, more than $45 billion was lost to insect pests.

China: Pest loss accounts for more than 1 5 percent of crop output value; In 1992, the cotton output was reduced by 1 3 due to cotton bollworm, and the direct loss was 10 billion yuan. The locust plague in Chinese history is appalling, with an average outbreak every 35 years, and more than 800 locust plagues occurred in 707 and 1949.

Insects are both beneficial and harmful to humans.

In the larvae will harm the grafting.

And in the case of adults, it is advantageous.

Humans study insects.

Insects are studied by humans.

There are both positives and negatives.

First of all, harmful insects will damage vegetables, crops, forests, shelters, food, furniture, clothing, etc., and at the same time spread diseases, endanger health, and seriously threaten people's production, life, work and study.

Secondly, beneficial insects bring us honey, silk, medicinal herbs, raw materials for life and production, and at the same time can help pollinate crops and fruit trees and carry out biological control work.

Finally, each insect is a unique gene pool that can provide scientific research for humans and can also make useful inventions for us through biomimicry. In particular, it is worth mentioning that while harmful insects are harmful to us, in addition to improving people's immunity and promoting the co-evolution of plants, we have also developed some science and technology through prevention and control.

Therefore, the relationship between humans and insects is:

1.Make use of valuable insects.

2.Protect beneficial insects.

3.Exterminate harmful insects.

Some humans are like insects.

Insects can be eaten, insects can be used as medicine, insects can be aesthetically harmed, insects can harm crops.

The insects we are talking about are generally from the phylum Arthropoda, such as spiders and centipedes, which are arachnids and myriapods of the phylum Arthropods, respectively. Whereas insects refer to the class Insecta of the phylum Arthropods. Insecta is the phylum Arthropod and the most diverse class in the animal kingdom, they are characterized by hexapods, no bones, the body is supported by a hard shell on the body surface, divided into three growth stages of eggs, larvae and adults, and the body is multi-segmented.

Spiders, centipedes, etc. are bugs but not insects. That is, insects are bugs, but bugs are not insects.

The bug is you, the insect is me, it's different, thank you. , ahaha.

What are the effects of insects on humans? The effects of insects on humans are extensive and complex, ranging from beneficial to and harmful to humans.

1. Insects provide beneficial services to humans.

1. Insects provide food and industrial raw materials for human beings. Some insect products, such as honey, silk, white wax, dyes, pigments, etc., are raw materials for human food and industry.

2. Insects provide media means for crops and trees. The propagation of insect crops, trees, and flowers provides pollen transmission, and 2 3 flowering plants worldwide rely on insects to transmit pollen.

3. Insects are an important part of the balance of the ecosystem. Some insects in the world feed on putrid biological organisms and animal excrement. In ecosystems, insects can decompose large amounts of dead leaves, dead animals, and large amounts of waste, and return them to the soil to complete the material cycle.

4. Insects provide a balance for the survival of animals. There are insects in the world that are parasitic and parasitize other insects or animals outside and in vivo. Some mammals rely on insects to capture parasites on their bodies during their growth; Some animals rely on insects to digest food; So insects play an important role in maintaining the balance between certain plants and animals.

2. The harm caused by insects to humans.

1. Insects compete with humans for food. Insects destroy a large amount of human food and agricultural products every year (before and after harvest), and at least 20 to 30% of the world's agricultural products are eaten by insects every year.

2. Insects destroy buildings. Insects live in large numbers on the roofs, inside of buildings, and on the ground; In particular, timber-framed houses are often eroded by insects, which reduces the lifespan of the building.

3. Insect-borne diseases. Insects have a strong ability to transmit human or animal diseases, and many viruses in the world are transmitted by insects.

4. Insects destroy plants in large numbers. Some of the insects are herbivorous, which are easy to be ignored by people in a small area, and when a large area of insect plague occurs, it can destroy thousands of acres of fertile land; Hundreds of acres of trees are extinct.

For details, please refer to:

Harmful aspects: Many are important pests of agricultural and forestry plants and storage. For example, East Asian plantworms, sticky insects, rice planthoppers, rice leaf rollers, etc., which harm cereal crops; cotton pests such as cotton aphid, cotton red bollworm, etc.; cabbage worms, diamondback moths, etc., which harm vegetables; the five-tailed pine caterpillar, pine and black beetle, etc., which endanger the forest; Warehouse storage pests such as corn elephants, broad bean elephants, etc.

In addition, termites seriously damage buildings, embankments, bridges, sleepers, etc.

There are also many insects that endanger the health of humans and animals, and there are 2 3 human infectious diseases that use insects as vectors, such as plague and typhus. Mosquitoes, fleas, lice, gadflies, stinging flies, etc. are blood-sucking insects, and stable flies can suck the blood of cattle and horses, and transmit diseases.

This insect is extremely harmful to humans, extremely destructive, and can eat all kinds of things and even metals.

It is only known that flowers are pollinated by wind and insects, and the absence of insects means that flowers cannot be pollinated, and the absence of pollination means that there is no fruit. Every single potato