Nervous systems,function and survival Essay Example | Topics and Well Written Essays - 1000 words

Nervous systems,function and survival - Essay Example Sensory nervous system for instance sends viable information across to the CNS. The kind of information send through this channel is mostly gotten from external stimuli or from internal organs. From the CNS, the cells from the motor nervous system will carry loads of relevant information to organs, glands and muscles (Rudolf, 2008). Some elements of the nervous system perform such vital functions as contracting the bladder, constricting pupils as well as inhibiting heart rates. These are done by the parasympathetic division of the nervous system. On the same breath, the sympathetic division reverses these by speeding up the heart rate, relaxing the bladder and even dilating the pupils. This is in form of corrective measure to avert potential danger that accelerated heart rate can come with. It is said that each and every emotion that one experiences has to pass through the central nervous system. The CNS plays a pivotal role to initiate certain systems of reactions as soon as it is t riggered. As soon as the CNS starts to facilitate these systems, thoughts, experiences and movements, it does so to reach the rest of the body through organs, neurons and cells. A sense of balance is also vital to the body. This means that the body may want to stick to a strict mode of operation. The CNS manages to assist the body do this so as to enable one survive. Response to situations that are considered stressful are also controlled as much as possible, mostly through the launch of adrenaline that makes the stress patterns have little or no effect on the rest of the body. The CNS also manages to regulate serotonim production which has adverse effects on daily functions of life like desire for sex, hunger and sleep (Valery, 2006). The human body has immune system that contains various organs. These organs have billions of cells that function towards facilitating immunity. The endocrine system always releases hormones that support CNS so as to enable people or animals survive. T he white blood cells are the major stars in this effort as they check for foreign invaders in circulation of the blood. They facilitate immune response and fight against any unwanted materials that may invade the blood or the tissues. Living with stress tends to threaten the stability of an individual or an animal, and therefore homeostasis tends to restore the balance by responses that are either behavioral or physiological to attack intruders. The severity by which the intruders attack will act to activate the CNS which will in turn appoint the relevant adaptive responses. In this way the body stays quite safe and has the ability to fight diseases (Valery, 2006). Doctors have pointed out in studies that inflammations are the major causes of degenerative and chronic diseases like allergies, arthritis, cancer, diabetes chronic fatigue, heart disease, lupus as well as many other diseases. This form of inflammation causes strong response witnessed from immune systems against pathogens that cause illness and physical injury. All these diseases have adverse effects on the immune system especially if they occur alongside stress. The immune system will be overcrowded and hence weakened leading to a compromise state of affairs in the immune system and hence this exposes people to many other illnesses (Rudolf, 2008). Hormones release is majorly done to facilitate