You could give me a general reason. But I would really prefer if you laid out the mechanisms if it is possible. Such as what nervous system is activated, what hormones are sent, what receptors are activated and etc.....
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The process of shock is a long and complicated one. I will do my best to sum it up but even this explanation will be a bit long.
When the body first begins to have a massive hemorrhage, the body begins to notice that the blood pressure and oxygenation level (of all cells) is not being maintained at the current heart rate it is at. One of the first things that will happen is that blood vessels will begin to constrict to try and maintain constant oxygenation of cells without changing heart rate. When this becomes ineffective, the heart rate will begin to increase. It is when this happens that the body is considered to be in "compensated shock" the respiration will begin to increase as well as the heart rate. The endocrine system will begin to secrete chemicals such as Renin, Angiotensin and anti diuretic hormone. All of these play a major role in maintaining blood pressure through preserving it's fluid volume. If the hemorrhage is not corrected, the body will then go into "de compensated shock" in which all of these chemicals are not enough to maintain adequate perfusion to the body's cells. Eventually the body will not be able to maintain perfusion through increasing the heart rate. This is when heart begins to go in such arrhythmia's as Supra ventricular tachycardia in which the heart beats too fast to adequately allow the ventricles to fill before contracting. It is after this when the heart begins to go into "irreversible shock". This is when the heart cannot compensate at all or the body does not have enough blood itself to oxygenate all of its parts.
As you may expect, this is only a piece of all of the info you will need to know about shock. There are five types of shock but in the end they all boil down to hypovolemic through one process or another. The actual definition of shock is "a state where the body cannot provide adequate perfusion to the body's cells". If this does not answer your question totally, feel free to message me at "stringbanger7@yahoo.com" and i will provide you with some pwerpoints which may better explain these concepts. I should warn you that it will take several hours to understand all of the concepts in their entirety.
To hit a specific point of your question, all of these functions are from the "sympathetic nervous system"
When the body first begins to have a massive hemorrhage, the body begins to notice that the blood pressure and oxygenation level (of all cells) is not being maintained at the current heart rate it is at. One of the first things that will happen is that blood vessels will begin to constrict to try and maintain constant oxygenation of cells without changing heart rate. When this becomes ineffective, the heart rate will begin to increase. It is when this happens that the body is considered to be in "compensated shock" the respiration will begin to increase as well as the heart rate. The endocrine system will begin to secrete chemicals such as Renin, Angiotensin and anti diuretic hormone. All of these play a major role in maintaining blood pressure through preserving it's fluid volume. If the hemorrhage is not corrected, the body will then go into "de compensated shock" in which all of these chemicals are not enough to maintain adequate perfusion to the body's cells. Eventually the body will not be able to maintain perfusion through increasing the heart rate. This is when heart begins to go in such arrhythmia's as Supra ventricular tachycardia in which the heart beats too fast to adequately allow the ventricles to fill before contracting. It is after this when the heart begins to go into "irreversible shock". This is when the heart cannot compensate at all or the body does not have enough blood itself to oxygenate all of its parts.
As you may expect, this is only a piece of all of the info you will need to know about shock. There are five types of shock but in the end they all boil down to hypovolemic through one process or another. The actual definition of shock is "a state where the body cannot provide adequate perfusion to the body's cells". If this does not answer your question totally, feel free to message me at "stringbanger7@yahoo.com" and i will provide you with some pwerpoints which may better explain these concepts. I should warn you that it will take several hours to understand all of the concepts in their entirety.
To hit a specific point of your question, all of these functions are from the "sympathetic nervous system"