Coordination System in Animals

In principle, the same animals coordinate system with coordinate systems that involve humans following things .

1 . The release of chemical substances from the cells into the extracellular fluid .
2 . Transport substances from one part to another part.
3 . Activation or deactivation of the cells that are affected by substance . In this section , we discuss some animal coordinate system that has special properties . The animals in question among worms , insects , snakes , and frogs .

1 . Worms Coordination System

The composition of the nervous system in the form of worms rope ladder system . Planarians , which belonged to the flatworm has a central nervous system and peripheral nervous system . The central nervous system in the brain called planaria are also the anterior ganglion . The brain is small . Peripheral nervous system of worms in the form of two channels towards posterior , each nerve are located in the lateral area of ​​the worm 's body , the two are connected by the connecting nerves . Nerves are also composed of bilateral symmetry is used to respond to light . When exposed to the flatworms , the brain will tell the worms move to the dark place , for example at the bottom of the stone . Consider Figure 9.21 .



Unlike the planaria , annelids ( eg leeches ) have a greater number of neurons in the brain . Nerves are located along the ventral nerve of his body is composed of several ganglion . In the ganglion there are interneurons which coordinate the various actions on each segment .

2 . Insects Coordination System

Insect nervous system consists of the central nervous system and peripheral nervous system , the nervous system in the form of a rope ladder . In the locust central nervous system is composed of groups of nerve cell bodies called ganglia . Each ganglia are connected by one or more nerve cords . Meanwhile, the locust peripheral nerve composed of sensory axons and motor axons to and from the ganglia . Consider Figure 9:22 .






On insect endocrine gland is more widely used for the process of growth and metamorphosis . During the growth period , the insect will shed eksoskeletonnya periodically . This moulting process called molting . Molting occurs until the adult stage . Which led to the molting hormone is a hormone ekdison . This hormone is produced from cooperation protorasik gland located in the chest and the hormones produced by the brain .

Brain insects also produce hormones that affect the process of metamorphosis , ie juvenile hormone . This hormone serves to inhibit the process of metamorphosis . Juvenile hormone secretion is enough to make ekdison stimulate the growth of the larvae . However , if the reduced secretion of this hormone will stimulate the development of pupae ekdison . Note the moulting process in the following figure . Consider Figure 9.23 .




When this hormone glands removed by taking the corpora alata imminent metamorphosis process and lead to the development of adult animals .

Insects also produce pheromones , for example ants mensekresikannya of glands in the head . These hormones are rapidly diffuses in all directions . Pheromones can be detected by other ants that are a few centimeters from the source , for example, on the trail of worker ants who are returning to the nest with food . This trail is attractive and lead other ants to food sources . Pheromones are updated

continuously throughout the food is still there . However , when supply starts to shrink then all traces of making stops . Ant pheromone trail evaporates quickly so that other ants can not reach that place .

The system senses of sight in contrast to insects and vertebrates Molusca . Eye on the insect 's compound eye or eyes called facets because it consists of repeated channel is omatidia . Each channel serves as a separate visual receptor . Each omatidium contribute information that only a local named object . Omatidium others provide information about other areas . Combined whole response of all omatidia an interesting shadow , so that it will form a pattern of light and dark spots that make up the entire view .

3 . Snakes and Frogs Coordination System

Both of these animals have organs odorant receptor response ( or taste ) very well , which is a Jacobson's organ . This organ is located in the palate . Alternately they pulled her tongue into the air and then into the Jacobson's organ . Such behavior makes them able to feel the air and detect any odor .

Coordination System in Animals 2013-12-20T06:55:00-08:00 Rating: 4.5 Diposkan Oleh: Unknown