NOTE: Free essay sample provided on this page should be used for references or sample purposes only. The sample essay is available to anyone, so any direct quoting without mentioning the source will be considered plagiarism by schools, colleges and universities that use plagiarism detection software. To get a completely brand-new, plagiarism-free essay, please use our essay writing service.
One click instant price quote
Insects are numerous invertebrate animals that belong in the Phylum Arthropoda and Class Insecta. The class Insecta is divided into 2 subclasses: Apterygota, or wingless insects, and Pterygota, or winged insects. SubclassPterygota is futher divided on basis of metamorphosis. Insects that have undergone incomplete metamorphosis are the Exopterygota. Insects that undergo complete metamorphosis are the Endopterygota. Insects have an outer bilateral exoskeleton to which the muscles are attached to and provides protection for internal organs.
The body is divided into 3 main parts which are the head, which include mouthparts, eyes, and antennae; thorax, which operate the jointed legs and /or wings; and abdomen, which has organs for digested food, reproducing, and getting rid of waste products. The major systems in insects are the circulatory, respiratory, nervous, muscular, digestive, and reproductive systems. In the circulatory system, blood is pumped by the heart in a tube to the aorta, the head, and to other organs then enters the ostia openings along the sides of the tube back to the heart. The respiratory systems carries O 2 to cells and takes away CO 2 from cells through branching out to call cells of body. The nervous system consists of a brain receiving information from eyes, antennae, and controls the whole body and 2 nerve cords containing ganglia fused together to control activities of the segment without the help of the brain. insect muscular system is made of a few thousand same but string muscles allowing the insect to carry objects heavier than it.
The digestive system is basically a long tube where food enters the mouth to the crop where it is stored, gizzard where it is granted, stomach where it is digested, then the undigested parts and wastes are moved the intestine, colon then released at the anus. And in the reproductive system, a new individual is produced sexually when the female eggs produced inthe ovaries united with male sperm produced in the testes. Both man and insect live almost everywhere, eat all kinds of food, and usually kinds of materials to build homes so they constantly live in conflict. Some insects seriously affect mans health and are parasitic on man and other animals. insects that feed on human or animal blood can carry disease in their salivary juices and spread the disease to other animals. Many insects irritates without disturbing our health.
Some bite and sting, and some people are allergic to them and some insects are injurious to our agricultural crops, food products, clothing, and wooden buildings. So far man has only partial success in defending against insects. But some insects species are beneficial to man. The honey bee, for example, supplies us with honey and the silkworm supplies us with silk. So bugs really arent that bad.
Free research essays on topics related to: insect, insects, organs, metamorphosis, tube
Research essay sample on Class Insecta Insects System
