РефератыИностранный языкBiBiology Instinct Essay Research Paper Insects are

Biology Instinct Essay Research Paper Insects are

Biology Instinct Essay, Research Paper


Insects are neumerout


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. Subclass


Pterygota 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 O2 to cells


and takes away CO2 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 acti

vities


of the segment without the help of the brain. insect


muscular system is made


up of a


few thousand samll 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 grinded,


stomach where it is digested, then the undigested parts


and wastes are moved


to the intestine, colon then released at the anus. And


in the reproductive


system, a new individual is produced sexually when the


female eggs produced in


the ovaries united with male sperm produced in the


testes.


Both man and insect live almost everywhere, eat all kinds of food,


and use


all kinds of materials to build homes so they constantly live in


conflict.


Some insects seriously affect man’s 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 irritate


us 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 aren’t that


bad.

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