Reference no: EM132371407
Please explain the synopsis of this article in detail.
Fight-or-flight response, response to an acute threat to survival that is marked by physical changes, including nervous and endocrine changes, that prepar human or an animal to react or to retreat. The functions of this response were first described in the early 1900s by American neurologist and physiologist Walter Bradford Cannon.
When a threat is perceived, the sympathetic nerve fibres of the autonomic nervous system are activated. This leads to the release of certain hormones from the endocrine system. In physiological terms, a major action of these hormones is to initiate a rapid, generalized response. This response may be triggered by a fall in blood pressure or by pain, physical injury, abrupt emotional upset, or decreased blood glucose levels (hypoglycemia). The fight-or-flight response is characterized by an increased heart rate (tachycardia), anxiety, increased perspiration, tremour, and increased blood glucose concentrations (due to glycogenolysis, or breakdown of liver glycogen). These actions occur in concert with other neural or hormonal responses to stress, such as increases in corticotropin and cortisol secretion, and they are observed in some humans and animals affected by chronic stress, which causes long-term stimulation of the fight-or-flight response.
In addition to increased secretion of cortisol by the adrenal cortex, activation of the fight-or-flight response causes increased secretion of glucagon by the islet cells of the pancreas and increased secretion of catecholamines (i.e., epinephrine and norepinephrine) by the adrenal medulla. The tissue responses to different catecholamines depend on the fact that there are two major types of adrenergic receptors (adrenoceptors) on the surface of target organs and tissues. The receptors are known as alpha-adrenergic and beta-adrenergic receptors, or alpha receptors and beta receptors, respectively (see human nervous system: Anatomy of the human nervous system). In general, activation of alpha-adrenergic receptors results in the constriction of blood vessels, contraction of uterine muscles, relaxation of intestinal muscles, and dilation of the pupils. Activation of beta-receptors increases heart rate and stimulates cardiac contraction (thereby increasing cardiac output), dilates the bronchi (thereby increasing air flow into and out of the lungs), dilates the blood vessels, and relaxes the uterus.
Research on nervous system diseases
: You are doing research on nervous system diseases; particularly, one that dissolves lipids. What part of the neuron would you expect to be affected
|
Depending on personal experience in obtaining health care
: Depending on one's personal experience in obtaining health care, or one's view of the role of physicians in society, of law as a tool for social change,
|
Learned about punnett squares
: In your lab reading and in class, you learned about Punnett squares. Punnett squares illustrate the probability of different genotypes and phenotypes appearing
|
Explain the new infection control and training program
: Create a Powerpoint presentation to explain the new infection control and training program you will implement in your healthcare facility.
|
American neurologist and physiologist walter bradford cannon
: The functions of this response were first described in the early 1900s by American neurologist and physiologist Walter Bradford Cannon.
|
Homeostatic feedback loop
: Does a homeostatic feedback loop only function when there is a change from the set point?
|
Discussion of at least two phenomenological research methods
: A discussion of at least two phenomenological research methods that emerged from the phenomenological philosophy of Husserl.
|
Define and evaluate key issues in global health
: Define and evaluate key issues in global health. Demonstrate the impact of global health issues on domestic and international security.
|
Groups using your own classification system
: Consider the following plants; White oak, White pine, Multiflora rose, Apple, Potato, Coconut Put them into two or three groups using your own classification
|