The nervous system is the network of nerves and nerve cells that transmit impulses throughout the body. There are two main components of the nervous system: theCentral Nervous System and the Peripheral Nervous System. The peripheral nervous system (PNS) is composed of nerves branching out from the brain as well as the spinal cord. This system can be divided into the autonomic nervous system and somatic nervous system. The autonomic nervous system is also referred to as the involuntary nervous system because this system can function involuntarily and reflexively. The autonomic nervous system controls the function of all the glands of the body which include endocrine glands, hypothalamus, pituitary gland, thyroid gland, parathyroid gland, adrenal gland, pancreas, pineal gland, ovaries, and testes. This system plays a critical role in controlling visceral functions. The act of blushing is regulated by a part of the autonomic nervous system known as the sympathetic nervous system.
One of the divisions of the autonomic nervous system is the sympathetic nervous system. The other division is the parasympathetic nervous system. The sympathetic nervous system can increase the heart rate and strength of the ventricular contraction, which increases the cardiac output. This takes place when the body is usually in fight or flight mode. Hormones that are released from the adrenal medulla, for example, epinephrine and norepinephrine function to increase the cardiac output by increasing the heart rate during fight or flight response. Epinephrine and norepinephrine are also described as stress hormones. The main function of these two hormones is to increase the glucose level in the blood and upsurge blood flow to all body organs. A balance between the parasympathetic division and sympathetic divisions enables the autonomic nervous system to regulate internal organs. The sympathetic nervous system is responsible for giving rise to the fight-or-flight response. In a threat condition, the sympathetic nervous system results in the stimulation of the release of stress hormones, including catecholamines. The motor system and autonomic nervous system are the two efferent components of PNS. The motor system carries signals to skeletal muscles, whose movement is under conscious control. The autonomic nervous system is divided into enteric division, sympathetic division, and parasympathetic division. Sympathetic division accelerates metabolic rate and heart rate. The enteric division includes neuron networks that are involved in the control of the digestive tract, gallbladder, and pancreas. Parasympathetic divisions enhance activities that conserve energy, such as slowing heart rate and digestion.
Homeostasis
The management of pain by health professionals includes building a comfortable relation and communication with the patient. The essential tools at the time of pain assessment help in better understanding the level of pain experienced by the patient. The sympathetic nervous system works with the parasympathetic nervous system so that the body can be maintained in homeostasis. The sympathetic nervous system shows such activities that indicate the pain in the patient. However, in the absence of sympathetic activities, the vital signs that are noted that help to determine the pain and relieve the pain. The vital signs include the body’s temperature, blood pressure, pulse rate, and respiratory rate. The sympathetic nervous is responsible for stimulating the secretion of adrenaline as well as noradrenaline by the adrenal medulla. During stressed conditions, the adrenaline hormone is responsible for enhancing the heart rate as well as the rate of blood flowing to the brain and muscles. It also results in stimulation of the process involved in converting glycogen to glucose and elevating the blood glucose level. In threat conditions, the noradrenaline hormone along with adrenaline hormone also increases blood pressure through a process called vasoconstriction. The process of voiding urine from the urinary bladder is referred to as micturition. This process is also known as urination. The muscle that regulates this process is under the control of the somatic and autonomic nervous system of the body. The injury of the nervous system can result in re-emergence of reflex micturition and cause urinary incontinence. Students generally lack attention in class immediately after a meal because the parasympathetic division is dominant at this time. The parasympathetic division has been nicknamed the rest-and-digest division because it is most active when the body is at rest or digesting a meal. During this time, energy stores are being replenished, and digestive activities are predominant. A student tends to be less alert during parasympathetic-dominant times.
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