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Eassay on the topic stress
About stress
Short summary about stress
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Stress, a word usually associated with experiences that are challenging both emotionally and physiologically, is an internal or external signal alluding to potential threats. Understanding stress is of utmost importance as it is important biologically, enabling adaptive processes to one’s ever-changing environment (Gunnar & Quevedo, 2007). Animal stress responses are composed of the activation of neurobiological systems that help preserve viability through allostasis, an active process by which the body responds to daily events and maintains a state of equilibrium (McEwen, 2007).
There are two systems in which the stress responses of mammals are affected: the sympathetic-adrenomedullary system (SAM) and the hypothalamic-pituitary-adrenocortical system (HPA axis). The SAM is part of the system which releases adrenaline/epinephrine from the center of the adrenal gland. These increases in the circulation of epinephrine enable rapid mobilization of metabolic resources and organization of the fight or flight response. In contrast, the production of glucocorticoids by the HPA axis takes time and is able to pass through the blood brain barrier (Gunnar & Quevedo, 2007; McEwen, 2007). But what is the method behind the HPA axis?
The anatomical structures known to mediate the stress response are found within both the central nervous system and peripheral tissues. If one were to take a deeper look into the HPA axis, it would be clear that the effectors of this stress response are localized within the paraventricular nucleus of the hypothalamus (PVN), the anterior lobe of the pituitary gland, and adrenal glands. Neurons localized in the PVN synthesize corticotropin releasing factor (CRF) and vasopressin. CRF, a key neuropeptide, has been im...
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...stress. Journal of Psychosomatic Research, 53(4), 865-871.
Vyas, A., Mitra, R., Shankaranarayana Rao, B. S., & Chattarji, S. (2002). Chronic stress induces contrasting patterns of dendritic remodeling in hippocampal and amygdaloid neurons. Neuroscience, 22(15), 6810-8.
Vyas, A., Pillai, A. G., & Chattarji, S. (2004). Recovery after chronic stress fails to reverse amygdaloid neuronal hypertrophy and enhanced anxiety-like behavior. Neuroscience, 128, 667-673. doi:10.1016/j.neuroscience.2004.07.013
Vyas, A., Jadhav, S., & Chattarji, S. (2006). Prolonged behavioral stress enhances synaptic connectivity in the basolateral amygdala. Neuroscience, 143, 387-393.
Wilber, A., Walker, A., Southwood, C., Farrell, M., Lin, G., Rebec, G., et al. (2011). Chronic stress alters neural activity in medial prefrontal cortex during retrieval of extinction. Neuroscience, 174, 115-131.
Adrenaline and glucocorticoids are critical to survival. Animals’ stress responses turn off after escaping from life-threatening situations. However, humans’ stress response come from a psychological state of fear or threat. We are often stressed out due to traffic, increasing taxes, instead of actual life-or-death situations. What’s worse, we are stressed constantly. Since we cannot
McEwen, B. S., & Gianaros, P. J. (2011). Stress-and allostasis-induced brain plasticity. Annual review of medicine, 62, 431-445.
The amygdala is where all the information is gathered from all our senses. It requests all the stress hormones to be released from the hippocampus or the hypothalamus, the pituitary and the adrenal glands. This gets the body ready for either flight, freeze or fight mode (Rosenthal, 2015). These glands releases noradrenaline, epinephrine, cortisone and glucose which gets pumped into your limbs making you ready to fight or run away from the situation (Seahorn, 2016). The increase in stress hormones interferes with the body to regulate itself and the nervous systems remains highly activated leading to the body being fatigue (Rosenthal, 2015).
Prolonged stress or distress can be a hindrance to the homeostasis of the animal and cause responses in the body that induce the animal to overwork its physiological systems. The animals that endure this prolonged stress are placed into an inevitable environment or circumstance where the animal either is or feels trapped or captured.
Cortisol is in the class of hormones called glucocorticoids and affects almost every organ in the body. One of the most important functions of cortisol is to help regulate the body’s response to stress. Cortisol is also responsible for other necessary functions including: helping to maintain blood pressure and cardiovascular functions, helping to slow the immune system’s inflammatory response, helping to balance the effects of insulin in breaking down sugars for energy, helping to regulate the metabolism of proteins, carbohydrates, and fats, and helping to maintain proper arousal of sense of well being. The amount of cortisol is precisely balanced and regulated by the brain’s hypothalamus.
For survivors of traumatic events, the trauma itself is often only the beginning. While some are relatively unaffected, many others will develop post-traumatic stress disorder, or PTSD, an affliction that haunts its victims with terrifying memories, nightmares, and panic attacks. (For a comprehensive list of symptoms and diagnostic criteria, the reader may refer to the DSM-IV, relevant portions of which may be found online (7).) The National Institute of Mental Health estimates that 3.6 percent of Americans between the ages of 18 and 54 suffer from PTSD; 30 percent of those who have spent time in war zones - one million veterans of Vietnam alone - are affected (6). PTSD is treated with several forms of psychotherapy, including exposure therapy, centered around a controlled confrontation of frightening stimuli. While medication may treat co-occurring depression, anxiety, or insomnia (6), pharmacological agents targeting PTSD remain unavailable. In part, this is because researchers have only begun to describe the underlying neurobiology. Several recent studies have pointed to the brain structure known as the amygdala as a central player, but questions remain: How does this small structure "recognize" danger? How does it create emotional memories? What causes recurrence of these memories?
Talge, N. M., Neal, C., & Glover, V. (2007). Antenatal maternal stress and long-term effects on child neurodevelopment: how and why?. Journal of Child Psychology and Psychiatry, 48(3/4), 245-261.
LaPlante, Charil A., DP, C. Vaillancourt, and S. King. "Prenatal Stress and Brain Development." NCBI. U.S. National Library of Medicine, 05 Oct. 2010. Web. 03 Nov. 2013.
To a great extent, stress can be a helpful response, especially for prehistoric humans. During this era, our species needed to react quickly to outside stimuli through a response of “fight or flight”. Through stress, certain hormones are released to help the individual resist the stressor, which may have meant running away from a natural predator. Thus, stress is a positive response that ensures the survival of the species. However, stress over a prolonged period of time causes exhaustion in the individual. Consequently, although stress can be helpful for individuals today, many often experience chronic stress, inflicting varying degrees of damage to their bodies.
Until now, there has not been a definite understanding of how post-traumatic stress disorder occurs in the brain. The exploration into its pathophysiology is fairly recent. However, there is research around it discussing about PTSD’s pathophysiology and coming to a complete understanding. In a normal person without the disorder, a stress hormone, adrenaline, releases from the body and prepares it to flee o...
Kumar, Anil, Puneet Rinwa, Gurleen Kaur, and Lalit Machawal. "Stress: Neurobiology, consequences, and management." Journal of Pharmacy and Bioallied Sciences, 2013: 1-7.
During this response certain hormones are released, which speed the heart rate, slow digestion, and reroute blood flow, in order to elicit the desired response of fight or flight. The behavioral response to stress involves coping. “Coping refers to active efforts to master, reduce, or tolerate the demands created by stress” (Weiten & Lloyd, 2006, pp.... ... middle of paper ... ...
First, stress is defined as an unpleasant state of emotional and physiological arousal that people experience in situations that they perceive as dangerous or threatening to their well being (Patel, 14). Stress is a universal feeling to everyone but the word stress means different things to different people. Some people define stress as events or situations that cause them to feel tension, pressure or negative emotions such as anxiety or anger (Patel, 15). Other people may view stress as a process involving a person’s interpretation and response to a threatening event. In any case, stress has many facets of how one perceives and responds to the certain predicament that is ailing them.
Stressors initiate a response within the organism and causes changes in the body, specifically responses in the body’s autonomic nervous system. The autonomic nervous system has two branches: the sympathetic and parasympathetic autonomic nervous system. The sympathetic autonomic nervous system helps the body deal with the stress it encounters, initiating the ‘fight or flight’ response. Once the threat has passed, the parasympathetic autonomic nervous system will take over, relaxing the body. There is a balance between these two in a healthy person. However, when someone stays on guard, using the sympathetic autonomic nervous system, all sorts of physical effects can
Gastrointestinal problems including ulcers and irritable bowel syndrome are not caused by stress but stress can contribute to episodes of illness and exaggerate the effects by causing the gut to become overactive (Smith & Fawcett, 2006). Stress stimulates the release of hydrochloric acid within the gut while inhibiting the protective mucosa in the gut, this makes the environment of the gut more acidic thus affecting the body’s ability to heal and combat ulceration (Wilson, 2005). Recurrent headaches and migraines have been linked to stress, caused by the tension and contraction of head and neck muscles and increased activity of adrenaline and noradrenaline within the stress response (Carson, 2006, Sarafino & Smith, 2014). Skin conditions such as acne, eczema and psoriasis can all be caused or be influenced by stress (Tausk, Ellenkov & Moynihan, 2008). According to Nolen-Hoeksema, Frederickson, Loftus & Wagenaar (2009), it is commonly perceived that people with psychophysiological disorders do not need treatment as the illnesses and symptoms are a manifestation of the psychological stress and do not require medical intervention. In fact, Nolen-Hoeksema et al (2009) argue that it is believed that stress is a key factor in over half of all